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A007648
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n*18^n + 1 is a prime.
(Formerly M3079)
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3
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1, 3, 21, 23, 842, 1683, 3401, 16839, 49963, 60239, 150940, 155928
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listen;
history;
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internal format)
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OFFSET
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1,2
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COMMENTS
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REFERENCES
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H. Dubner, Generalized Cullen numbers, J. Rec. Math., 21 (No. 3, 1989), 190-191.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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MATHEMATICA
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k = 0; While[k < 10001, If[PrimeQ[k*18^k + 1], Print@ k]; k++] (* Robert G. Wilson v, Aug 19 2013 *)
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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Error in description corrected 8/97.
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STATUS
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approved
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