A102141 Iccanobirt prime indices (11 of 15): Indices of prime numbers in A102121.

4, 6, 7, 15, 25, 51, 126, 171, 311, 358, 865, 1850, 3311, 4686, 7893, 8249, 17795, 27176, 48728

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• base

Comments

No more terms through 5000.

a(20) > 50000. - Robert Price, Nov 10 2018

Crossrefs

Cf. A000040, A102121, A102131-A102145.

Programs

Mathematica

a[n_] := a[n] =
   IntegerReverse[a[n - 1] + IntegerReverse[a[n - 2]] + IntegerReverse[a[n - 3]]];
a[0] = 0; a[1] = 0; a[2] = 1;
Select[Range[0, 5000], PrimeQ[a[#]] &] (* Robert Price, Apr 10 2020 *)

Formula

A102121(a(n)) = A102161(n).

Extensions

a(15)-a(19) from Robert Price, Nov 10 2018