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A007646
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Numbers n such that n*4^n + 1 is prime.
(Formerly M2699)
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1
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1, 3, 7, 33, 67, 223, 663, 912, 1383, 3777, 3972, 10669, 48375
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| 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
| G. Loeh, Generalized Cullen primes
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CROSSREFS
| Sequence in context: A115088 A089622 A143967 * A120566 A057480 A051256
Adjacent sequences: A007643 A007644 A007645 * A007647 A007648 A007649
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KEYWORD
| hard,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com)
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
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