A235862 Indices of primes in the tribonacci-like sequence, A141523.

0, 3, 4, 5, 8, 10, 14, 16, 24, 30, 40, 54, 63, 66, 67, 109, 188, 203, 421, 463, 704, 730, 798, 1155, 1259, 1376, 1789, 2095, 2650, 3833, 4538, 4794, 4840, 5386, 8348, 15176, 17282, 21250, 21386, 21825, 31242, 32843, 33706, 37026, 47546, 66848

Offset

1,2

Comments

a(47) > 2*10^5.

Links

Table of n, a(n) for n=1..46.

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={3, 1, 1}; Print[0]; 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.

Sequence in context: A278998 A211533 A079136 * A228305 A103329 A080726

Adjacent sequences: A235859 A235860 A235861 * A235863 A235864 A235865

Keyword

nonn

Author

Robert Price, Jan 16 2014

Status

approved