A104069 Primes of the form 2^k + 31.

47, 4127, 68719476767, 3599131035634557106248430806148785487095757694641533306480604458089470064537190296255232548883112685719936728506816716098566612844395439751206812144692131084107807

Offset

1,1

Comments

Associated values of k are 4, 12, 36, 540, 844, 1192, ... . - M. F. Hasler, Nov 13 2010

Links

Table of n, a(n) for n=1..4.

Formula

a(n) = 2^A247952(n) + 31. - Elmo R. Oliveira, Nov 08 2023

Mathematica

a = Delete[Union[Flatten[Table[If [PrimeQ[2^n + 31] == True, 2^n + 31, 0], {n, 1, 400}]]], 1]

Prog

(Magma) [a: n in [0..750] | IsPrime(a) where a is 2^n+31] // Vincenzo Librandi, Nov 13 2010
(PARI) for(n=0, 999, ispseudoprime(p=2^n+31) & print1(p", "))  \\ M. F. Hasler, Nov 13 2010

Crossrefs

Cf. A000040, A247952 (associated values of k).

Sequence in context: A327770 A005148 A123798 * A334180 A194617 A217229

Adjacent sequences: A104066 A104067 A104068 * A104070 A104071 A104072

Keyword

nonn

Author

Roger L. Bagula, Mar 02 2005

Status

approved