previousPrime {numbers} | R Documentation |
Previous Prime
Description
Find the next prime below n
.
Usage
previousPrime(n)
Arguments
n |
natural number. |
Details
previousPrime
finds the next prime number smaller than n
,
while nextPrime
finds the next prime number below n
.
In general the previousn prime will occur in the interval
[n-1,n-log(n)]
.
In double precision arithmetic integers are represented exactly only up to 2^53 - 1, therefore this is the maximal allowed value.
Value
Integer.
See Also
Examples
p <- previousPrime(1e+6) # 999983
isPrime(p) # TRUE
[Package numbers version 0.8-5 Index]