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Construct the Seidel-Entringer-Arnold triangle

Several problems in Cody ask us to construct part or all of triangles in which entries follow a pattern. Cody Problems <https://...

6 months ago

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Evaluate the Struve function

The <https://en.wikipedia.org/wiki/Struve_function Struve function> *H*_a(x) is a solution to an inhomogeneous form of Bessel's ...

6 months ago

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Compute the perimeter of an ellipse

While the area of an ellipse is straightforward to compute, the perimeter (or circumference) is more complicated. The perimeter ...

6 months ago

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Counting the Grand Primes

A grand prime pair is a pair of primes, p1 and p2=p1+1000, such that both numbers are prime. Like a twin prime pair, where the d...

6 months ago

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Find Pseudo-Cyclic Number

A cyclic number is an integer in which cyclic permutations of the digits are successive multiples of the number https://en.wikip...

6 months ago

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Amicable numbers

Test whether two numbers are <https://en.wikipedia.org/wiki/Amicable_numbers amicable>, meaning that the sum of the proper divis...

6 months ago

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Pseudo Square Root (Inspired by Project Euler 266)

Shamelessly copied from the Project Euler page for Problem 266: ------------- The divisors of 12 are: 1,2,3,4,6 and 12. T...

6 months ago

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Bouncy numbers

Inspired by Project Euler nÂ°112. * * Working from left-to-right if no digit is exceeded by the digit to its left it is call...

6 months ago

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Eulerâ€“Mascheroni constant

Approximate the Euler-Mascheroni constant using the series representation gamma_n=\sum_{k=1}^{n} [1/k-ln(1+1/k)] Calculat...

6 months ago

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Approximate e

Given a and n, compute and approximation to f = a * e ^ n, without the use of exp, string operations, or floating point numbers....

6 months ago

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How many unique Pythagorean triples?

For a given integer |n|, return all <https://en.wikipedia.org/wiki/Pythagorean_triple Pythagorean triples> that inlude numbers s...

6 months ago

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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...

6 months ago

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Consecutive Powers

Return 2 numbers and 2 powers such that their difference is 1 A 4 element row vector is expected: x where x(1)^x(2) - x(...

6 months ago

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Find two triangular numbers whose sum is input.

Find two triangular numbers whose sum is _input_. Note: The difference beetween the triangular numbers should be minimum.

6 months ago

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I'm going to enjoy watching you calculate, Mr Anderson

Smith numbers are numbers such that if you add up all of the digits in the number, that sum equals the sum of all of the digits ...

6 months ago

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Polar Form Complex Number Entry

Write a function that takes the magnitude and angle(in degrees) of a complex number and returns a complex variable. Positive ang...

6 months ago

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How brilliant are you?

A Brilliant number is defined as a number with two prime factors, both of which have the same number of digits. Some examples: ...

6 months ago

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calculate PI without using pi function

There are many methods to get the pi(Ratio of circumference to diameter). You should get pi without using the pi function in M...

6 months ago

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Give me Hamming on five, hold the mayo

A Hamming Number is a positive number that has no prime factor greater than 5. Given a number X, determine how many Hamming num...

6 months ago

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Hilbert numbers

Given a positive integer, n, return h as follows: 1. If n is not a <https://en.wikipedia.org/wiki/Hilbert_number Hilbert numb...

6 months ago

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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...

6 months ago

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Nth roots of unity

First, find the n nth roots of unity. eg if n = 6, find the n distinct (complex) numbers such that n^6 = 1. <https://en.wiki...

6 months ago