A217892 Indices of records in A194591.

1, 5, 13, 47, 59, 109, 241, 335, 1109, 1373, 1447, 14893, 37892, 56543, 185644, 649603, 838441, 8840101, 16935761, 100604513, 118373279, 270704167, 1355477231

Offset: 1

Author

Max Alekseyev, Oct 14 2012

Keywords

• more
• nonn

Comments

Record values are given by A194600.

Crossrefs

Cf. A194635, A194639

Programs

Mathematica

a[n_]:= (k=0; While[!PrimeQ[n*2^k-1] && !PrimeQ[n*2^k+1], k++]; k); w = {1}; v = {0}; Do[If[a[n]>v[[-1]], AppendTo[v, a[n]]; Print[n]], {n, 1356000000}] (* Farideh Firoozbakht, Oct 16 2014 *)

Extensions

a(23)=A194639(22) from Wilfrid Keller, added by Max Alekseyev, Oct 18 2014