|
| |
|
|
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
|
| |
|
|
