A255531 Indices of primes in the 9th-order Fibonacci number sequence, A251747.

10, 16, 116, 236, 316, 1376, 5066, 103696, 120949

Offset

1,1

Comments

a(10) > 2*10^5.

Links

Table of n, a(n) for n=1..9.

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

Mathematica

a={0, 0, 0, 0, 0, 0, 1, 0, 0}; step=9; 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[Table[1, {9}], {0, 0, 0, 0, 0, 0, 1, 0, 0}, 125000], _?PrimeQ]]-1 (* Harvey P. Dale, Nov 29 2017 *)

Crossrefs

Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523, A214825, A235862, A000288, A000322, A000383, A249413, A060455, A079262, A251747.

Sequence in context: A056848 A219854 A167331 * A157159 A176664 A256346

Adjacent sequences: A255528 A255529 A255530 * A255532 A255533 A255534

Keyword

nonn,more

Author

Robert Price, Feb 24 2015

Status

approved