Tim

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Identify de Polignac numbers
The numbers 125 and 329 can be written as the sum of a prime and a power of 2. For example, , and . The numbers 127 and 331, whi...

circa 7 ore fa

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Goldbach's marginal conjecture - Write integer as sum of three primes
Goldbach's strong conjecture states that every even integer greater than 2 can be expressed as the sum of two primes. For exampl...

circa 8 ore fa

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Lah Numbers
Create a square lower diagonal matrix containing the first n Lah number coefficients. In mathematics, the Lah numbers are coeffi...

circa 8 ore fa

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Find the next Fibonacci number
In the sequence of Fibonacci numbers, every number is the sum of the two preceding ones: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55...

3 giorni fa

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Determine whether a number is a Ludic prime
Ludic numbers are formed by a sieve. Start with a list of the positive integers. Skip 1 and start with 2. Then delete every seco...

10 giorni fa

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Identify points inside a Reuleaux triangle
Write a function to identify points that lie in or on a Realeaux triangle, which is a curve of constant width. The input to the ...

10 giorni fa

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Find the closest canyon prime
My wife and I celebrated our honeymoon and most recent anniversary in Yellowstone and Grand Teton National Parks. After returnin...

23 giorni fa

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Build a block Toeplitz matrix
A symmetric block Toeplitz matrix has the form, where the are compatibly-sized matrices. Write a routi...

27 giorni fa

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List composite numbers that do not contain their prime factors as substrings
The number 63 has the prime factorization 3, 3, and 7, and it contains one of them (3) as a substring. In contrast, the number 4...

28 giorni fa

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Sum along each diagonal of a matrix
Write a routine that returns the sums along the diagonals of a given matrix, A, where the first diagonal is the bottom left corn...

28 giorni fa

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2x2 binning of a large sparse matrix
Consider the 20000 x 20000 sparse matrix, A=round(sprand(2e4,2e4,1/1e4*100)*1000); The task is to divide this matrix into 2x...

circa un mese fa

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Throwing Dice - Will You Be Eaten By The Dragon?
You and a dragon have agreed to let dice rolls determine whether it eats you or not. The dragon will roll a single die, of x si...

circa un mese fa

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List the partitions of an integer
Several Cody problems deal with partitions of an integer, or the ways an integer can be written as the sum of positive numbers—...

circa 2 mesi fa

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Compute the dispersion coefficient
A contaminant dumped or spilled into a river will move downstream with the flow, but it will also spread in the flow direction b...

circa 2 mesi fa

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Describe n from right to left
If you were to describe the number 46 from right to left, you could say “one 6, one 4”, or 1614. The number 8663 would be “one 3...

circa 2 mesi fa

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Extend the digamma function to negative arguments
While solving one of Ramon Villamangca’s problems, I needed the value of , where is the digamma function. However, MATLAB’s fun...

circa 2 mesi fa

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List Ormiston prime pairs
The numbers 1913 and 1931 form the first Ormiston prime pair. The numbers are consecutive primes, and they are anagrams of each ...

circa 2 mesi fa

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Moyenne pondérée
Ecrire une fonction qui prend en entrée un vecteur P et un vecteur V et calcule la moyenne pondérée MP des élements vi d'un vec...

2 mesi fa

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Special matrix
Make a square matrix with this shape. For n=4 M = 1 1 0 0 1 0 1 0 0 1 0 ...

2 mesi fa

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Explore the twin prime Goldbach conjecture
The Goldbach conjecture says that every positive even integer greater than 2 can be expressed as the sum of two prime numbers in...

2 mesi fa

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Write a code to implement Euler's method to integrate a simple function
Euler's method approximates the solution to a differential equation as where . The challenge is to write a code that can take...

2 mesi fa

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Given the mass and stiffness of an undamped SDOF system, find the natural frequency and the natural period of vibration
Problem Statement Given the mass and stiffness of an undamped SDOF system, find the system's natural frequency in both Hz and...

2 mesi fa

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Juros Simples
Faça uma função que calcule o montagem de um investimento com juros simples que receba como argumentos o capital inicial C, a ta...

2 mesi fa

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String Logic 18
Examples: 'DIG' --> 'DG' 'IMPORTANT' --> 'IPRAT' 'DEAL' --> 'DA' 'LIMB' --> 'LM' 'MOSTLY' --> 'MSL'

2 mesi fa

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Day counter function
Write a function called day_counter that returns the number of Mondays that fell on the first day of the month in a given year b...

2 mesi fa

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Flip the vector from right to left
Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not to use d...

2 mesi fa

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GJam 2017 Kickstart: Parentheses (Large)
This Challenge is derived from <http://code.google.com/codejam/contest/6304486/dashboard#s=p2 GJam 2017 Kickstart Parentheses>. ...

2 mesi fa

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Independent direction vectors of a plane
Given the equation of a plan of the form ax+by+cz=d, return 2 independent direction vectors which could e.g. be used to determin...

2 mesi fa

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Palindrome Checker
Check to see if a given string is a palindrome (a word, phrase, or sequence that reads the same backward as forward). Output sh...

2 mesi fa

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Sum All Positive Elements
Output a scalar that is equal to the sum of all positive elements in a given vector/matrix. For Example: The sum of all positi...

2 mesi fa

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