A102143 Iccanobirt prime indices (13 of 15): Indices of prime numbers in A102123.

4, 6, 7, 11, 55, 56, 69, 87, 109, 191, 314, 4579, 6281, 6400, 23256, 31648

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• base

Comments

a(17) > 50000. - Robert Price, Nov 10 2018

Crossrefs

Cf. A000040, A102123, A102131-A102145.

Programs

Mathematica

a[n_] := a[n] =
   IntegerReverse[IntegerReverse[a[n - 1]] + 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

A102123(a(n)) = A102163(n).

Extensions

a(13)-a(16) from Robert Price, Nov 10 2018

Offset changed to 1 by Jinyuan Wang, Aug 02 2021