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A247027 Indices of primes in the tetranacci sequence A001631. 9
5, 7, 12, 19, 47, 97, 124, 244, 564, 1037, 12007, 13662, 180039 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(14) > 2*10^5.
LINKS
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={0, 0, 1, 0}; For[n=4, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[4]]=sum]
CROSSREFS
Sequence in context: A031144 A314312 A160243 * A020686 A011984 A280291
KEYWORD
nonn,more
AUTHOR
Robert Price, Sep 09 2014
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)