A233554 Indices of primes in the tribonacci-like sequence, A020992.

1, 3, 6, 15, 19, 22, 207, 542, 2374, 10579, 17726, 43182

Offset

1,2

Comments

a(13) > 2*10^5.

Links

Table of n, a(n) for n=1..12.

Mathematica

a={0, 2, 1}; Print[1]; 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.

Sequence in context: A249246 A248969 A174279 * A276546 A265486 A060304

Adjacent sequences: A233551 A233552 A233553 * A233555 A233556 A233557

Keyword

nonn

Author

Robert Price, Dec 12 2013

Status

approved