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A104069 Primes of the form 2^k + 31. 1
47, 4127, 68719476767, 3599131035634557106248430806148785487095757694641533306480604458089470064537190296255232548883112685719936728506816716098566612844395439751206812144692131084107807 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Associated values of k are 4, 12, 36, 540, 844, 1192, ... . - M. F. Hasler, Nov 13 2010
LINKS
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
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Mar 02 2005
STATUS
approved

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Last modified February 21 11:54 EST 2024. Contains 370235 sequences. (Running on oeis4.)