A141275 Composite indices associated with A141274.

5, 17, 23, 41, 73, 97, 103, 113, 131, 137, 151, 173, 211, 229, 277, 317, 337, 347, 367, 421, 439, 463, 499, 503, 523, 557, 601, 631, 647, 677, 691, 727, 769, 827, 857, 881, 887, 907, 911, 1013, 1021, 1069, 1087, 1091, 1103, 1151, 1201, 1249, 1303, 1321

Offset: 1

Author

Enoch Haga, Jun 21 2008

Keywords

• easy
• nonn

Crossrefs

Cf. A141274.

Programs

Mathematica

a141274=Select[Range[4,1600],!PrimeQ[#]&&PrimeQ[#+1]&&PrimeQ[#-PrimePi[#]-2]&];findx[n_]:=n-PrimePi[n]-2;findx/@a141274 (* James C. McMahon, Jul 19 2025 *)

Extensions

Edited by N. J. A. Sloane, Jun 21 2008