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A247027
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Indices of primes in the tetranacci sequence A001631.
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9
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5, 7, 12, 19, 47, 97, 124, 244, 564, 1037, 12007, 13662, 180039
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OFFSET
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1,1
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COMMENTS
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a(14) > 2*10^5.
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LINKS
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MATHEMATICA
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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]
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CROSSREFS
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Cf. A001590, A001631, A100683, A231574, A231575, A232542, A214899, A230607, A020992, A232498, A214727, A081172, A214752, A141523,A214825, A235862.
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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