login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A235396 Indices of primes in the tribonacci-like sequence, A081172. 0
3, 4, 5, 9, 12, 16, 24, 32, 101, 116, 245, 34553, 52517, 99245, 140197 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(16) > 2*10^5.

LINKS

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

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, 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.

Sequence in context: A108018 A166976 A240056 * A237132 A080633 A242800

Adjacent sequences:  A235393 A235394 A235395 * A235397 A235398 A235399

KEYWORD

nonn

AUTHOR

Robert Price, Jan 09 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 9 21:57 EDT 2020. Contains 335545 sequences. (Running on oeis4.)