# schoolmath

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**I**n connection with the Le Monde puzzle of last week, I was looking for an R function that would give me the prime factor decomposition of any integer. Such a function exists within the package schoolmath, developped by Joerg Schlarmann and Josef Wienand. It is called prime.factor and it returns the prime factors of any integer:

> prime.factor(2016)

[1] 2 2 2 2 2 3 3 7

> prime.factor(2032)

[1] 2 2 2 2 127

> prime.factor(2031)

[1] 3 677

> prime.factor(2039)

2039 is a prime!

[1] 2039

Filed under: R Tagged: arithmetics, prime factor decomposition, prime numbers, R

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