

A200816


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


7



1, 3, 4, 10, 11, 16, 47, 57, 69, 166, 327, 460, 1108, 4740, 20760, 21143, 27779, 34293, 34311
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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

4 is in the sequence because (2^4  4)*2^4 + 1 = 193 is prime.


MATHEMATICA

lst={}; Do[If[PrimeQ[(2^n  n)*2^n+1], AppendTo[lst, n]], {n, 10^3}]; lst


PROG



CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



