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Generalised Hamming Number

Inspired by Project Euler n°204 and Problem 1308 by James A generalised Hamming number of type n, has no prime factor larger ...

12 months ago

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Factorize THIS, buddy

List the prime factors for the input number, in decreasing order. List each factor only once, even if the factorization includes...

12 months ago

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Get all prime factors

List the prime factors for the input number, in decreasing order. List each factor. If the prime factor occurs twice, list it as...

12 months ago

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Numbers with prime factors 2, 3 and 5.

Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are...

12 months ago

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Find vampire numbers

A <http://en.wikipedia.org/wiki/Vampire_number vampire number> is a number v that is the product of two numbers x and y such th...

12 months ago

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Find all vampire fangs

A <http://en.wikipedia.org/wiki/Vampire_number vampire number> is a number v that is the product of two numbers x and y such th...

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Fangs of a vampire number

A <http://en.wikipedia.org/wiki/Vampire_number vampire number> is a number v that is the product of two numbers x and y such tha...

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Proper Factors

Generate the proper factors of input integer _x_ and return them in ascending order. For more information on proper factors, ref...

12 months ago

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Multiples of a Number in a Given Range

Given an integer factor _f_ and a range defined by _xlow_ and _xhigh_ inclusive, return a vector of the multiples of _f_ that fa...

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Project Euler: Problem 3, Largest prime factor

The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number being input, input might be ui...

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Smith numbers

Return true if the input is a Smith number in base ten. Otherwise, return false. Read about Smith numbers at <http://en.wikipedi...

12 months ago

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Prime factor digits

Consider the following number system. Calculate the prime factorization for each number n, then represent the prime factors in a...

12 months ago

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Divisible by n, Composite Divisors

Pursuant to <http://www.mathworks.com/matlabcentral/cody/problems/42453-divisible-by-n-prime-vs-composite-divisors Divisible by ...

12 months ago

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Divisible by n, Truncated-number Divisors

Some divisors only require a few numbers at the end of the number in question to determine divisibility, no matter how long. Exa...

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Divisible by n, prime divisors from 20 to 200

Pursuant to the previous problem (linked below), this problem requires a function that checks for divisibility of large numbers ...

12 months ago

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Divisible by n, prime divisors - 11, 13, 17, & 19

Divisibility checks against prime numbers can all be accomplished with the same routine, applied recursively, consisting of add ...

12 months ago

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Divisible by n, prime divisors (including powers)

For this problem, you will be provided an array of numbers (not necessarily in order). Return the array of numbers with only pri...

12 months ago

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Divisible by n, prime vs. composite divisors

In general, there are two types of divisibility checks; the first involves composite divisors and the second prime divisors, inc...

12 months ago

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Divisible by 16

Write a function to determine if a number is divisible by 16. This can be done by a few different methods. Here are two: # If...

12 months ago

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Divisible by 15

Write a function to determine if a number is divisible by 15. If a number is <http://www.mathworks.com/matlabcentral/cody/proble...

12 months ago

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Divisible by 14

Write a function to determine if a number is divisible by 14. If a number is <http://www.mathworks.com/matlabcentral/cody/proble...

12 months ago

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Divisible by 13

Write a function to determine if a number is divisible by 13. Similar to the number seven, this can be done by a few different m...

12 months ago

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Divisible by 12

Write a function to determine if a number is divisible by 12. Similar to the number six, this can be done by checking for divisi...

12 months ago

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Divisible by 11

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 10

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 9

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 8

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 7

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 6

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago

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Divisible by 5

Pursuant to the <http://www.mathworks.com/matlabcentral/cody/problems/42404-divisible-by-2 first problem> in this series, this o...

12 months ago