

A163115


Primes of the form 2^n + 2*n + 1.


4




OFFSET

1,1


COMMENTS

The corresponding values of n, i.e., 0, 1, 5, 13, 65, 85, 229, ... are of the form A192764()  1.  JuriStepan Gerasimov, Jul 25 2011
The next term, a(8), has 604 digits.  Harvey P. Dale, Dec 17 2013


LINKS

Table of n, a(n) for n=1..7.


EXAMPLE

a(1) = 2^0 + 2*0 + 1 = 2.
a(2) = 2^1 + 2*1 + 1 = 5.
a(3) = 2^5 + 2*5 + 1 = 43.
a(4) = 2^13 + 2*13 + 1 = 8219.


MATHEMATICA

Select[Table[2^n+2n+1, {n, 0, 300}], PrimeQ] (* Harvey P. Dale, Dec 17 2013 *)


CROSSREFS

Sequence in context: A286871 A027730 A225724 * A221682 A088309 A056680
Adjacent sequences: A163112 A163113 A163114 * A163116 A163117 A163118


KEYWORD

nonn


AUTHOR

JuriStepan Gerasimov, Jul 21 2009


EXTENSIONS

13 removed, 3 terms added by R. J. Mathar, Jul 27 2009


STATUS

approved



