

A186112


Numbers k such that 3*6^k + 1 is prime.


1



1, 2, 4, 6, 7, 8, 11, 15, 26, 29, 50, 66, 122, 225, 272, 275, 308, 390, 992, 1201, 2520, 15812, 17419, 29328, 41852
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OFFSET

1,2


COMMENTS

The primes produced by these values of n are in A186105.


LINKS



EXAMPLE

15 is in the sequence because 3*6^15+1=1410554953729 is prime.


PROG

(PFGW) ABC2 3*6^$a+1
a: from 1 to 50000


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



