A022757 n-th 4k+1 prime plus n-th 4k+3 prime.

8, 20, 28, 48, 60, 72, 96, 108, 132, 156, 168, 180, 192, 216, 244, 276, 288, 312, 332, 356, 364, 408, 424, 440, 468, 492, 504, 520, 544, 576, 588, 620, 656, 664, 704, 736, 756, 768, 788, 804, 852, 880, 896, 904, 972, 988, 1020, 1044, 1060, 1076, 1096, 1124

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A002144, A002145.

Programs

Mathematica

Select[1 + 4Range@150, PrimeQ@# &] + Select[ -1 + 4Range@135, PrimeQ@# &] (* Robert G. Wilson v, May 04 2006 *)

Formula

a(n) = A002144(n) + A002145(n). - Sean A. Irvine, May 20 2019