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A290376
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Prime Fubini numbers.
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1
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OFFSET
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1,1
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COMMENTS
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Corresponding indices are 2, 3, 5, 7, 9, 13, ... with no more up to 12000.
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LINKS
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MATHEMATICA
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a[0] = 1; a[n_] := a[n] = Sum[Binomial[n, k]*a[n - k], {k, 1, n}]; Select[a@# & /@ Range@ 20, PrimeQ@# &]
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PROG
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(PARI) lista(nn) = for (n=1, nn, if (isprime(fn=sum(k=1, n, k!*stirling(n, k, 2))), print1(fn, ", ")); ); \\ Michel Marcus, Aug 02 2017
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CROSSREFS
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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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