A247027 Indices of primes in the tetranacci sequence A001631.

5, 7, 12, 19, 47, 97, 124, 244, 564, 1037, 12007, 13662, 180039

Offset

1,1

Comments

a(14) > 2*10^5.

Links

Table of n, a(n) for n=1..13.

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, 1, 0}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[4]]=sum]

Crossrefs

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

Sequence in context: A373670 A160243 A373669 * A020686 A011984 A280291

Adjacent sequences: A247024 A247025 A247026 * A247028 A247029 A247030

Keyword

nonn,more

Author

Robert Price, Sep 09 2014

Status

approved