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1,1
The next term is too large to display here, having 1423 digits. See A005849.
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
a(n) = A002064(A005849(n))
lst={}; Do[If[PrimeQ[p=n*2^n+1], Print[p]; AppendTo[lst, p]], {n, 10^9}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 21 2008 *)
Select[Table[n*2^n+1, {n, 5000}], PrimeQ] (* Harvey P. Dale, Dec 14 2014 *)
See A005849 for more terms.
Sequence in context: A068740 A058473 A115527 * A001231 A141150 A089418
Adjacent sequences: A050917 A050918 A050919 * A050921 A050922 A050923
nonn,nice,bref
N. J. A. Sloane, Dec 30 1999
approved