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Find numbers in the Popular Computing Z-sequence
Here’s a quick one. In 1977 the magazine Popular Computing sought “problem situations for which the computer is the best (if not...

3 years ago

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Find the smallest integer m such that n divides m!
Write a function that takes an integer and finds the smallest integer whose factorial is divisible by . For example, if , then...

3 years ago

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Iterate the sum of divisors and totient

3 years ago

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Sum of all the divisors of n

3 years ago

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Compute the Sequence of the Day
A sequence starts with 1 and 2, and each subsequent term is the sum of the digits of the product of the previous two terms. As a...

3 years ago

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Evaluate the incomplete elliptic integrals
Elliptic integrals can be used to evaluate integrals whose integrands have the form R(x,sqrt(P(x))), where R(x,y) is a rational ...

3 years 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 ...

3 years ago

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Evaluate the zeta function for complex arguments
<https://www.mathworks.com/matlabcentral/cody/problems/45988 Cody Problem 45988> involved computing the Riemann zeta function fo...

3 years ago

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Evaluate the zeta function for real arguments > 1
The <https://en.wikipedia.org/wiki/Riemann_zeta_function Riemann zeta function> is important in number theory. In particular, th...

3 years ago

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List the dihedral primes
The number 1880111 is a dihedral prime (or dihedral calculator prime) because on a seven-segment display it is prime (a) forward...

3 years ago

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List composite numbers that cannot be written as the sum of two primes

3 years ago

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Count the primes in Collatz sequences
Several Cody problems (21, 69, 42937, 44448, 44784, 52422) involve Collatz sequences. These start with a seed . If is odd, the ...

3 years ago

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Solve the arithmetic differential equation D(n) = n

3 years ago

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Compute the arithmetic derivative of integers

3 years ago

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Play Outside In with primes

3 years ago

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Find pairs of primes with the same digit sum and a specified separation

3 years ago

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List prime anagrams of a number

3 years ago

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Label primes with the Erdos-Selfridge classification

3 years ago

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List the nth prime quartet prefix
Prime numbers larger than 5 can end only in 1, 3, 7, or 9, but of course not all numbers ending in these four digits are prime. ...

3 years ago

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Determine whether a number is unprimeable
The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...

3 years ago

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List Proth primes

3 years ago

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Identify prime words

3 years ago

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Find the smallest prime with n inside
Consider the sequence that begins 101, 113, 127, 131, 149, 151, 163,... Not only is every term prime, the th term is the smalles...

3 years ago

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Compute home primes in a given base

3 years ago

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Determine whether a number is a prime self number
Integers can be classified as generated numbers or self numbers. A generated number is one that can be expressed as the sum of a...

3 years ago

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Find the last digit
FInd the last digit of a given number. Given number is the input and output should be the last digit of that number.

3 years ago

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Find remainder when x is divided by 3
Find remainder when x is divided by 3

3 years ago

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0<=x<=pi?
Check whether the given angle is between zero and pi. Return logical true or false.

3 years ago

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Volume of Cylinder
Find the volume of a cylinder

3 years ago

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Row avg

3 years ago