OFFSET
1,1
EXAMPLE
The smallest positive integer with 8 divisors is 24. 24 - 1 = 23 is prime. But 24 + 1 = 25 is composite. So 23 is in the sequence, while 25 is not.
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Nov 30 2008
EXTENSIONS
Extended by Ray Chandler, Dec 05 2008
STATUS
approved