

A050920


Cullen primes: primes of the form n*2^n+1.


3




OFFSET

1,1


COMMENTS

The next term is too large to display here, having 1423 digits. See A005849.


LINKS

Table of n, a(n) for n=1..2.
Ray Ballinger, Cullen Primes: Definition and Status
C. K. Caldwell, Cullen Primes
Eric Weisstein's World of Mathematics, Cullen Number


FORMULA

a(n) = A002064(A005849(n))


MATHEMATICA

lst={}; Do[If[PrimeQ[p=n*2^n+1], Print[p]; AppendTo[lst, p]], {n, 10^9}]; lst [From Vladimir Joseph Stephan Orlovsky, Aug 21 2008]


CROSSREFS

See A005849 for more terms.
Sequence in context: A068740 A058473 A115527 * A001231 A141150 A089418
Adjacent sequences: A050917 A050918 A050919 * A050921 A050922 A050923


KEYWORD

nonn,nice,bref


AUTHOR

N. J. A. Sloane, Dec 30 1999


STATUS

approved



