A247946 Primes in the tetranacci sequence A000288.

7, 13, 181, 349, 673, 1297, 34513, 90799453, 175021573, 4657290577, 17304140641, 1131469145856472270556751793, 1544310310927991136025089626209, 1442398599584422734286432395814518441223501, 18598135820391234761502881488353916158281807617671450769

Offset

1,1

Comments

a(16) is too large to display here. It has 63 digits and is the 221st term in A000288.

Links

Table of n, a(n) for n=1..15.

Mathematica

a={1, 1, 1, 1}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[sum]]; a=RotateLeft[a]; a[[4]]=sum]
Select[LinearRecurrence[{1, 1, 1, 1}, {1, 1, 1, 1}, 300], PrimeQ] (* Harvey P. Dale, Jan 15 2015 *)

Crossrefs

Cf. A001590, A001631, A100683, A231574, A231575, A232543, A214899, A020992, A233554, A214727, A234696, A141523, A235862, A214825, A235873, A001630, A241660, A247027, A000288, A247561.

Sequence in context: A050946 A178956 A319612 * A210465 A181492 A243368

Adjacent sequences: A247943 A247944 A247945 * A247947 A247948 A247949

Keyword

nonn

Author

Robert Price, Sep 27 2014

Status

approved