A102135 - OEIS

%I #15 Oct 23 2024 10:25:17

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

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

%C No more terms through 5000.

%C a(14) > 50000. - _Robert Price_, Nov 08 2018

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

%t a[n_] := a[n] =

%t    IntegerReverse[a[n - 1]] + a[n - 2] + IntegerReverse[a[n - 3]];

%t a[0] = 0; a[1] = 0; a[2] = 1;

%t Select[Range[0, 5000], PrimeQ[a[#]] &] (* _Robert Price_, Apr 10 2020 *)

%t 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 *)

%Y Cf. A000040, A102115, A102131-A102145.

%K nonn,more,base

%O 1,1

%A _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004

%E a(11)-a(13) from _Robert Price_, Nov 08 2018