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

1,1

Comments

No more terms through 5000.

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

Links

Table of n, a(n) for n=1..13.

Formula

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

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 *)

Crossrefs

Cf. A000040, A102115, A102131-A102145.

Sequence in context: A213034 A102131 A102137 * A019251 A102134 A102133

Adjacent sequences: A102132 A102133 A102134 * A102136 A102137 A102138

Keyword

nonn,more,base

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Extensions

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

Status

approved