A242315 Indices of primes in the tribonacci-like sequence A214826.

4, 7, 23, 71, 379, 467, 596, 6372, 10100, 11660, 23099, 25419, 26011, 36588, 76895, 112867

Offset

1,1

Comments

a(17) > 2*10^5.

Links

Table of n, a(n) for n=1..16.

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, 4, 4}; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]

Crossrefs

Cf. A001590, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523,A214825, A235862, A214826.

Sequence in context: A027946 A348478 A363543 * A275313 A288299 A288763

Adjacent sequences: A242312 A242313 A242314 * A242316 A242317 A242318

Keyword

nonn

Author

Robert Price, May 10 2014

Status

approved