isPrimePower: Finds a prime power solution for N, if available.

In blocksdesign: Nested and Crossed Block Designs for Factorial and Unstructured Treatment Sets

Description

Tests if a given number N is a prime power and returns either the base prime p and power q or p = 0 and q = 0.

Usage

isPrimePower(N)

Arguments

N	the number to be tested for primality

Details

Finds the smallest integral solution for s = N**(1/i), which gives the smallest s such that s**i = N. Then, if s is a prime, the number N is a prime power with p = s and q = i.

Value

Returns the base prime p and the power q if N is a prime power; otherwise returns p = 0 and q = 0.

Examples

isPrimePower(N=13**5)
isPrimePower(N=25**5) ## 25 is prime-power 
isPrimePower(N=20**5) ## 20 is not prime-power
 

blocksdesign documentation built on April 8, 2021, 1:07 a.m.