A242316 Prime terms in the tribonacci-like sequence A214826.

17, 103, 1764391, 8907752079422393063, 28959877095025359725108610631647478770525190687597954707985655095645523042346644747326776183477265033

Offset

1,1

Comments

a(6) is too large to appear here, having 124 digits. It corresponds to A214826(467).

Links

Table of n, a(n) for n=1..5.

Mathematica

a={1, 4, 4}; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[sum]]; a=RotateLeft[a]; a[[3]]=sum]
Select[LinearRecurrence[{1, 1, 1}, {1, 4, 4}, 400], PrimeQ] (* Harvey P. Dale, Mar 17 2016 *)

Crossrefs

Cf. A001590, A100683, A231574, A231575, A232543, A214899, A020992, A233554. A214727, A234696, A141523, A235862,A214825, A235873 A214826, A242315.

Sequence in context: A142266 A214632 A160219 * A329386 A095785 A194131

Adjacent sequences: A242313 A242314 A242315 * A242317 A242318 A242319

Keyword

nonn

Author

Robert Price, May 10 2014

Status

approved