A122138 Indices k such that A122136(k) is a prime.

1, 2, 3, 4, 6, 8, 10, 11, 12, 14, 15, 18, 20, 22, 23, 26, 27, 32, 36, 38, 39, 40, 44, 47, 48, 50, 51, 52, 54, 55, 56, 58, 59, 60, 64, 66, 68, 71, 72, 74, 76, 78, 80, 83, 84, 86, 88, 89, 90, 92, 94, 95, 96, 98, 100, 102, 103, 107, 108, 110, 112, 114, 116, 118, 120, 122, 126

Offset: 1

Author

Alexander Adamchuk, Aug 21 2006

Keywords

• nonn

Comments

The corresponding primes are listed in A122139.

Crossrefs

Cf. A122136, A122137, A122139, A002110, A024450, A007504, A098999, A122102, A122103.

Programs

Mathematica

Select[Range[200],PrimeQ[Numerator[Sum[Prime[k]^2,{k,1,#1}]/Product[Prime[k],{k,1,#1}]]]&]