OFFSET
1,1
LINKS
R. J. Mathar, Table of n, a(n) for n = 1..14401
EXAMPLE
a(1)=321197185=5*19*23*29*37*137
PROG
(PARI) is(n)={omega(n)==6&&is_A002997(n)} \\ M. F. Hasler, Apr 14 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Shyam Sunder Gupta, Dec 11 2005
STATUS
approved