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A232543
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Indices of prime tribonacci numbers (A100683).
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22
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1, 2, 3, 4, 7, 11, 12, 27, 32, 119, 127, 136, 611, 755, 872, 1676, 5363, 15623, 27564, 42679, 54576, 74123, 91043, 104331
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OFFSET
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1,2
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COMMENTS
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a(25) > 2*10^5.
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LINKS
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MATHEMATICA
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a={-1, 2, 2}; Print[1], Print[2]; For[n=3, n<=1000, n++, sum=Plus@@a; If[PrimeQ[sum], Print[n]]; a=RotateLeft[a]; a[[3]]=sum]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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