OFFSET
1,1
LINKS
Shyam Sunder Gupta, Table of n, a(n) for n = 1..7173
EXAMPLE
645 is a pseudoprime (base 2) and 643 and 641 are primes.
CROSSREFS
KEYWORD
nonn
AUTHOR
Shyam Sunder Gupta, Oct 20 2013
STATUS
approved