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A247561 Indices of primes in the tetranacci sequence A000288. 6
5, 6, 10, 11, 12, 13, 18, 30, 31, 36, 38, 97, 108, 150, 196, 221, 277, 532, 596, 2468, 2691, 3773, 4303, 5755, 8925, 10083, 11708, 14080, 19990, 24102, 34767, 35973, 39238, 49760, 97706 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(36) > 2*10^5.

LINKS

Table of n, a(n) for n=1..35.

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={1, 1, 1, 1}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[4]]=sum]

Flatten[Position[LinearRecurrence[{1, 1, 1, 1}, {1, 1, 1, 1}, 10^5], _?PrimeQ]]- 1 (* Harvey P. Dale, Dec 20 2016 *)

CROSSREFS

Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523, A214825, A235862, A000288.

Sequence in context: A019205 A191472 A189056 * A273401 A042958 A265188

Adjacent sequences:  A247558 A247559 A247560 * A247562 A247563 A247564

KEYWORD

nonn,more

AUTHOR

Robert Price, Sep 27 2014

STATUS

approved

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)