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Search: id:A005849
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| A005849 |
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Prime Cullen numbers: numbers n such that n*2^n + 1 is prime.
(Formerly M5401)
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+0
9
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| 1, 141, 4713, 5795, 6611, 18496, 32292, 32469, 59656, 90825, 262419, 361275, 481899, 1354828
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(14)=1354828 from http://www.prothsearch.net/cullen.html - Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Apr 20 2006
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REFERENCES
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H. Dubner, Generalized Cullen numbers, J. Rec. Math., 21 (No. 3, 1989), 190-191.
P. Ribenboim, The Book of Prime Number Records. Springer-Verlag, NY, 2nd ed., 1989, p. 283.
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LINKS
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Ray Ballinger, Cullen Primes: Definition and Status
C. K. Caldwell, Cullen Primes
R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations
Primegrid, Home Page
Primegrid, Concerning a(15)
Eric Weisstein's World of Mathematics, Cullen Number
Eric Weisstein's World of Mathematics, Integer Sequence Primes
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CROSSREFS
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Cf. A002064, A050920, A002234.
Sequence in context: A031892 A063373 A068046 this_sequence A066623 A066627 A087001
Adjacent sequences: A005846 A005847 A005848 this_sequence A005850 A005851 A005852
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KEYWORD
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hard,nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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One more term from Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Apr 20 2006
The term 1467763 was added in error, and has now been deleted. Jens Kruse Andersen (jens.k.a(AT)get2net.dk), Nov 28 2007, remarks that 1467763*2^1467763-1 is a Woodall prime, but 3 divides the Cullen number 1467763*2^1467763+1.
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