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A050920
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Cullen primes: primes of the form n*2^n+1.
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2
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OFFSET
| 1,1
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COMMENTS
| The next term is too large to display here, having 1423 digits. See A005849.
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LINKS
| Ray Ballinger, Cullen Primes: Definition and Status
C. K. Caldwell, Cullen Primes
Eric Weisstein's World of Mathematics, Cullen Number
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FORMULA
| a(n) = A002064(A005849(n))
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MATHEMATICA
| lst={}; Do[If[PrimeQ[p=n*2^n+1], Print[p]; AppendTo[lst, p]], {n, 10^9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]
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CROSSREFS
| See A005849 for more terms.
Sequence in context: A068740 A058473 A115527 * A001231 A141150 A089418
Adjacent sequences: A050917 A050918 A050919 * A050921 A050922 A050923
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KEYWORD
| nonn,nice,bref
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 30 1999
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