A322302 Primes p such that 11*2^p + 1 is also prime.

3, 5, 7, 19, 43, 127, 211, 15329, 28277, 3771821

Offset

1,1

Comments

Primes in A002261.

Links

Table of n, a(n) for n=1..10.

Maple

select(p->isprime(p) and isprime(11*2^p+1), [$1..1000]); # Muniru A Asiru, Dec 20 2018

Mathematica

Select[Prime[Range[1000]], PrimeQ[11 2^# + 1] &]

Prog

(Magma) [p: p in PrimesUpTo (6000) | IsPrime(11*2^p+1)];
(GAP) Filtered([1..1000], p -> IsPrime(p) and IsPrime(11*2^p+1)); # Muniru A Asiru, Dec 20 2018

Crossrefs

Cf. A002261, A175172.

Sequence in context: A005850 A052334 A373292 * A154526 A126144 A171643

Adjacent sequences: A322299 A322300 A322301 * A322303 A322304 A322305

Keyword

nonn,more

Author

Vincenzo Librandi, Dec 20 2018

Extensions

a(10) from Joerg Arndt Dec 20 2018

Status

approved