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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 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

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