Previous Prime
Find the next prime below n.
previousPrime(n)
n |
natural number. |
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.
Integer.
p <- previousPrime(1e+6) # 999983 isPrime(p) # TRUE
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