A102135 Iccanobirt prime indices (5 of 15): Indices of prime numbers in A102115.

4, 6, 7, 19, 46, 613, 1146, 1500, 1982, 2590, 7278, 13714, 15929

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• base

Comments

No more terms through 5000.

a(14) > 50000. - Robert Price, Nov 08 2018

Crossrefs

Cf. A000040, A102115, A102131-A102145.

Programs

Mathematica

a[n_] := a[n] =
   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 *)
nxt[{a_,b_,c_}]:={b,c,Total[IntegerReverse[{a,c}]]+b};Flatten[Position[NestList[nxt,{0,0,1},2600][[;;,1]],?PrimeQ]]-1 (* The program generates the first 10 terms of the sequence. *) (* _Harvey P. Dale, Oct 23 2024 *)

Formula

A102115(a(n)) = A102155(n).

Extensions

a(11)-a(13) from Robert Price, Nov 08 2018