OFFSET
1,1
FORMULA
EXAMPLE
a(0)=2310 because 2310 follows the prime 2309 and has five factors 2, 3, 5, 7 and 11.
PROG
(PARI) isok(n) = (omega(n)==5) && isprime(n-1); \\ Michel Marcus, Jun 08 2014
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Enoch Haga, Dec 16 2007
EXTENSIONS
Edited by R. J. Mathar, Feb 20 2008
Typo in a(36) corrected by Seth A. Troisi, May 13 2022
STATUS
approved