A141208 a(n) = prime(prime(prime(n) - 1) - 1) - 1, where prime(n) = n-th prime.

1, 2, 12, 36, 106, 150, 238, 280, 396, 576, 612, 862, 1020, 1068, 1212, 1492, 1732, 1810, 2088, 2346, 2410, 2712, 2902, 3220, 3582, 3906, 4020, 4210, 4336, 4512, 5278, 5530, 5848, 6028, 6636, 6688, 7102, 7516, 7740, 8110, 8500, 8572, 9282, 9396, 9648

Offset: 1

Author

Juri-Stepan Gerasimov, Jul 31 2008

Keywords

• nonn

Crossrefs

Cf. A141139, A141185. - Juri-Stepan Gerasimov, Oct 25 2009

Cf. A140853.

Programs

Magma

[NthPrime(NthPrime(NthPrime(n)-1)-1)-1: n in [1..50]]; // Vincenzo Librandi, Apr 05 2015

Maple

p:=ithprime: seq(p(p(p(n)-1)-1)-1, n=1..53); # Juri-Stepan Gerasimov, Oct 25 2009

Mathematica

Table[Prime[Prime[Prime[n - 1] - 1] - 1] - 1, {n, 2, 50}] (* Vincenzo Librandi, Apr 05 2015 *)

Extensions

a(22) corrected by D. S. McNeil, Mar 21 2009