A102139 Iccanobirt prime indices (9 of 15): Indices of prime numbers in A102119.

4, 6, 7, 11, 15, 19, 233, 549, 1608, 4143, 4633, 9642

Offset: 1

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

• nonn
• more
• base

Comments

No more terms through 5000.

a(13) > 50000. - Robert Price, Nov 09 2018

Crossrefs

Cf. A000040, A102119, 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 *)

Formula

A102119(a(n)) = A102159(n).

Extensions

a(12) from Robert Price, Nov 09 2018