

A200823


Numbers k such that (2^k + k)*2^k + 1 is prime.


7



1, 3, 6, 14, 21, 27, 51, 61, 103, 123, 126, 414, 499, 1509, 2389, 5973, 8558, 12673
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OFFSET

1,2


COMMENTS

The generalization of this sequence is possible with the primes of the form (b^n + k)*b^n + 1.


LINKS



EXAMPLE

3 is in the sequence because (2^3 + 3)*2^3 + 1 = 89 is prime.


MATHEMATICA

lst={}; Do[If[PrimeQ[(2^n + n)*2^n+1], AppendTo[lst, n]], {n, 5000}]; lst


PROG



CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



