A174288 Primes p such that 8*2^(2p)-1 is also prime.

2, 5, 7, 29, 43, 1607

Offset

1,1

Comments

These are the primes in A139481. [From R. J. Mathar, Mar 17 2010]

Links

Table of n, a(n) for n=1..6.

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

Sequence in context: A082013 A171831 A192560 * A293062 A293063 A215211

Adjacent sequences: A174285 A174286 A174287 * A174289 A174290 A174291

Keyword

nonn

Author

Vincenzo Librandi, Mar 15 2010

Status

approved