A257227 Indices of primes in the 10th-order Fibonacci number sequence, A122265.

11, 361, 373, 2440, 14002, 68990

Offset

1,1

Comments

a(7) > 2*10^5.

Links

Table of n, a(n) for n=1..6.

Tony D. Noe and Jonathan Vos Post, Primes in Fibonacci n-step and Lucas n-step Sequences, J. of Integer Sequences, Vol. 8 (2005), Article 05.4.4.

OEIS Wiki, Index of Prime Fibonacci Numbers and Variants

OEIS Wiki, Index to OEIS Section Fi

Mathematica

a={0, 0, 0, 0, 0, 0, 0, 0, 0, 1}; step=10; lst={}; For[n=step, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], AppendTo[lst, n]]; a=RotateLeft[a]; a[[step]]=sum]; lst
Flatten[Position[LinearRecurrence[{1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 69000], _?PrimeQ]]-1 (* Harvey P. Dale, Dec 08 2017 *)

Crossrefs

Cf. A122265, A257228.

Sequence in context: A303116 A162019 A066268 * A176474 A000464 A291973

Adjacent sequences: A257224 A257225 A257226 * A257228 A257229 A257230

Keyword

nonn,more

Author

Robert Price, Apr 18 2015

Status

approved