A247192 Indices of primes in the hexanacci numbers sequence A000383.

7, 9, 30, 31, 33, 46, 52, 54, 82, 102, 109, 124, 210, 301, 351, 365, 369, 1045, 2044, 2125, 2143, 2815, 4377, 4754, 4893, 7310, 11558, 17602, 17929, 28389, 32100, 44298, 106725, 151678, 197953

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, 1}; For[n=5, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[5]]=sum]

Crossrefs

Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523, A214825, A235862, A000288, A000322, A000383, A249413.

Sequence in context: A242505 A263826 A066930 * A154260 A309199 A186234

Adjacent sequences: A247189 A247190 A247191 * A247193 A247194 A247195

Keyword

nonn,more

Author

Robert Price, Dec 03 2014

Status

approved