A048628 n-th 4k+1 prime times (n+1)st 4k+3 prime.

35, 143, 323, 667, 1147, 1763, 2491, 3599, 4891, 6319, 7663, 8383, 11227, 12091, 17399, 19519, 21823, 26123, 29503, 32231, 35263, 43739, 46367, 50851, 57311, 61063, 66203, 70531, 77059, 84823, 89711, 103459

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

a(n) = A002144(n) * A002145(n+1). - Sean A. Irvine, Jun 24 2021

Mathematica

Module[{nn=100, p1, p3, len}, p1=Select[Prime[Range[nn]], Mod[#, 4]==1&]; p3= Rest[Select[Prime[Range[nn]], Mod[#, 4]==3&]]; len=Min[Length[p1], Length[ p3]]; Times@@@Thread[{Take[p1, len], Take[p3, len]}]] (* Harvey P. Dale, Jan 09 2015 *)

Crossrefs

Cf. A002144, A002145, A022757.

Sequence in context: A346910 A290560 A136017 * A048629 A133534 A005339

Adjacent sequences: A048625 A048626 A048627 * A048629 A048630 A048631

Keyword

nonn

Author

Den Roussel (DenRoussel(AT)webtv.net)

Status

approved