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A102135
Iccanobirt prime indices (5 of 15): Indices of prime numbers in A102115.
1
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
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
KEYWORD
nonn,more,base
AUTHOR
EXTENSIONS
a(11)-a(13) from Robert Price, Nov 08 2018
STATUS
approved