OFFSET
0,1
COMMENTS
Look at all twin primes (p1, p2); if 2^p1 - 1 is composite print p2.
PROG
(PARI) twopm1(n) = { forprime(x=2, n, y=2^x-1; if(!isprime(y) && isprime(x+2), print1(x", ") ) ) }
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Oct 25 2003
EXTENSIONS
More terms from Ray Chandler, Nov 07 2003
STATUS
approved