OFFSET
1,1
COMMENTS
These are the primes in A139481. [From R. J. Mathar, Mar 17 2010]
EXAMPLE
For p=2, 8*2^4-1=127; p=5, 8*2^10-1=8191; p=7, 8*2^14-1=131071
PROG
(Magma) [p: p in PrimesUpTo(4500)| IsPrime(8*2^(2*p)-1)]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Mar 15 2010
STATUS
approved