What is the largest prime factor of the number being input, input might be uint64 for large numbers, out must be double precision?

### Highlighting Solutions to Project Euler Problems 001-005

Solution You should pass the x values as a string. A double precision number cannot resolve all the digits that one needs to solve the test suite problems:.

I agree that there is an issue with the last test suite problem. Return the largest number that is adjacent to a zero.

Stuff the Board. Is the Point in a Triangle? Insert zeros into vector. Make a random, non-repeating vector.

Getting the row and column location from a matrix. Project Euler: Problem 1, Multiples of 3 and 5. Project Euler: Problem 9, Pythagorean numbers. Project Euler: Problem 10, Sum of Primes.

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Toggle Main Navigation. Search MathWorks. Open Mobile Search. Trial software. Problem Solve Later. The prime factors of are 5, 7, 13 and Thank you to Project Euler Problem 3.

**Eulerian Path - Intro to Algorithms**

Solution Stats Last Solution submitted on Apr 15, GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.

If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Warning - This site contains spoilers. Please close this page immediately if you wish to solve the problems yourself.

Project Euler projecteuler. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

## Problem 234. Project Euler: Problem 3, Largest prime factor

As the name suggests, projecteuler-solutions is a collection of solutions for site Project Euler. This site aims to provide complete and accurate solution listings for Project Euler. After you struggle for hours or days on a difficult problem, you may eventually give up after all, the world would be a strange place if people never gave up on a problem.

At this point, you have two options:. Without a solution, you leave feeling frustrated; you feel as if all your effort had been for nothing.

With no way to check the right answer, you don't know how close you were to the solution or where you had gone wrong. If the solution required advanced techniques unfamiliar to you, you would have had no way of knowing. In the end, you have learned nothing, leaving without even the gratification of having figured out the problem.

With a solution, you can compare your method with the correct solution, perhaps figure out what you did wrong. Alternatively, you can peek at the solution as a sort of 'hint' -- that is, knowing the solver's general approach, figure out the details of his solution, then code the solution yourself.

Either way, you have gained from this problem -- as much as you would have gained had you solved the problem completely independently. In the end, the purpose of Project Euler isn't to compete for rankings. The main purpose of the activity is to learn and improve yourself in a challenging and fun way.

If you need to 'cheat' in order to learn from and enjoy the problems, so be it. Projecteuler-solutions provides merely a list of answers -- that is, it does not provide solutions or code for individual problems. The link to the list of answers can be found at the top of this page. With the numerical answers, you have access to the official forums, in which you can access dozens of solutions in numerous different programming languages, often using several very different approaches.

By unlocking this valuable resource for you, Projecteuler-solutions hopes that you will be able to get more out of Project Euler. For a thorough exposition of solutions, I recommend Project Nayukiwhich solves about of the problems using Java, Python, Mathematica, and Haskell. Of course, it is possible for one to mindlessly copy and paste solutions one by one into Project Euler to gain ranks.

Obviously, this is quite pointless, as Project Euler ranks can gain you nothing in the real world. Your account is likely to get banned, and you are only cheating yourself of mathematical learning. If you have the answer to a problem whose answer we do not yet have, or notice that an existing answer is incorrect, we would love to hear from you! Either create an issue on this repository, or email me at luckytoilet gmail.Solution Reverse the vector. Flip the main diagonal of a matrix.

The Answer to Life, the Universe, and Everything. Project Euler: Problem 5, Smallest multiple. Make blocks of color. Project Euler: Problem 4, Palindromic numbers. Steal, Share, or Catch: Tournament of Champions. Flag largest magnitude swings as they occur. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance.

Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search MathWorks. Open Mobile Search. Trial software. Problem Project Euler: Problem 1, Multiples of 3 and 5. Submitted on 15 Apr at Size: 80 Leading solution size is 7. This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

Suggested Problems Pizza! Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site.

Assertion failed.Project Euler with Matlab. Search this site. Problem 1. Problem 2. Problem 3. Problem 4. Problem 5. Problem 6. Problem 7. Problem 8.

Problem Beam Deflection GUI. Galerkin Method. Problem 9. Links My Matlab blog. My name is Andrew, and I am a fourth year mechanical engineering student. Unfortunately, whenever I need to look around for help I seem to only find sites dedicated to solving them in Python, Java, etc. Thus, I wanted to create a site in which I outline my thought pattern and code that I used in Matlab.

I have no formal programming experience and I admit my code can be quite barbaric at times, but again this site is not for advanced Matlab users or computer scientists, just engineers hoping to get more practice with Matlab by solving fun little math challenges.

Also, I would love for people to make recommendations or question parts of my code. Finally, I'm a complete novice when it comes to website design, so please bear with. If you have any recommendations to formatting or site mapping feel free to let me know and I'll try to get this site more visually appealing. I am going to be using a blogger page to run through the more challenging problems as I attempt them.

I'll also try and get some of my previous Matlab assignments and problems on there as a reference. Also, the method I was using to generate a comment box has gone under. It's a great way to learn the language, and definitely benefits us both! I finally stumbled across Cody, a similar set of problems with leveling up, experience, and a community within the mathworks website!

You should check it out, it's tailored more specifically for us Matlab users, and I'm going to start solving problems and posting solutions for that so keep an eye out! You can find the problems here! Home My name is Andrew, and I am a fourth year mechanical engineering student. Update: I am going to be using a blogger page to run through the more challenging problems as I attempt them. Update 2: I finally stumbled across Cody, a similar set of problems with leveling up, experience, and a community within the mathworks website!

Follow me!GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Since I've just decided to create this repository, all solutions are not here. You are welcome to fill in the gaps that I have in my table below.

Thanks to Lewis Lovette for building this glorious table. If you have not solved a problem, academic code of honour restricts you from viewing the solutions of those problems. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Sign up. My solutions to Project Euler problems. Java Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commitâ€¦. Academic Code of Honour If you have not solved a problem, academic code of honour restricts you from viewing the solutions of those problems. You signed in with another tab or window. Reload to refresh your session.

You signed out in another tab or window. Other Languages. V1 V2. Solution [Explanation]. Solution [Sage]. V1 V3. Solution [Rust].Here I make my solutions publicly available for other enthusiasts to learn from and to critique.

Each problem that I solved always includes a Java program. Almost all my solved problems also include a Python program except for a few. Many problems additionally have a Mathematica and Haskell program. Among the web, this is perhaps the largest collection of Project Euler solutions in the Java programming language.

Every Java solution depends on these shared classes: EulerSolution. Many Python solutions depend on my shared math library module: eulerlib. Many Haskell solutions depend on my shared math library module: EulerLib.

Some solution code contains a detailed mathematical proof of correctness. For every problem that I solved, I have a Java solution for it and possibly code in other languages as well. I like using Java because it is fast, safe, and expressive. Custom data structures like graphs are difficult to express cleanly in Mathematica. Custom algorithms like the sieve of Eratosthenes, especially ones most naturally expressed in terms of imperative state updates, are difficult to implement correctly or efficiently in Haskell.

Non-strict evaluation in Haskell makes it easy to accidentally leak large amounts of memory in unexpected places. This is because it has many useful built-in mathematical functions like prime testing and objects like fractions that would require manual effort to implement in Java.

Also, my Java solutions tend to be long due to types on every variable, lots of custom code, and low-level loops instead of higher-order functions. Note that for problems involving non-whole numbers, I try to use exact integer arithmetic or fractions as much as possible, which ensures that the solution is provably correct.

As a result I strongly avoid any floating-point arithmetic at all, unless there is no other reasonable way that I know of to solve the problem.

Also I study the numerical bounds carefully to avoid integer overflow, and use the most reasonably narrow type for speed choosing between intlongor BigInteger. To run a Java solution, compile the Java file e. Then run with a command like java pand the answer will be printed to standard output.

Almost all solutions are made available in Python, which is an imperative object-oriented language with many conceptual similarities to Java. My code requires Python 3 but old versions can be found that support both 2 and 3. The Python solutions were initially based on the Java solutions, often starting with a direct literal port of the Java code into Python. Mathematica provides easy access to prime numbers, big integers, high-precision floats, fractions, continued fractions, and more.

My code tends to be quite short: one-liners are very common, and typically the solution is less than 5 lines of code. Occasionally I write imperative code in Mathematica, usually for unbounded searching. To run a Mathematica solution, copy the entire code into a new Mathematica notebook and evaluate the whole block of text. The solution is shown in the output. The algorithms between different languages are not exactly the same; instead I try to write code that is most idiomatic and clear for the given language.

All the numbers listed in the table below are in seconds, and these computing environments were used:. To run a Haskell solution, run the Haskell file as a main program.

All the numbers listed in the table below are in seconds, and these computing environments were used: Oracle Java CPython 3. Wolfram Mathematica 5. Glasgow Haskell Compiler 7. Browse files. Download ZIP. Overview of Project Nayuki software licenses. Chemical equation balancer JavaScript.Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

The motivation for starting Project Euler, and its continuation, is to provide a platform for the inquiring mind to delve into unfamiliar areas and learn new concepts in a fun and recreational context.

The intended audience include students for whom the basic curriculum is not feeding their hunger to learn, adults whose background was not primarily mathematics but had an interest in things mathematical, and professionals who want to keep their problem solving and mathematics on the cutting edge. The problems range in difficulty and for many the experience is inductive chain learning.

That is, by solving one problem it will expose you to a new concept that allows you to undertake a previously inaccessible problem. In order to track your progress it is necessary to setup an account and have Cookies enabled. If you already have an account then Loginotherwise please Register â€” it's completely free! However, as the problems are challenging then you may wish to view the Problems before registering.

Who are the problems aimed at? Can anyone solve the problems? What next?

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