login
A182331
Primes of the form 6^k + 1.
9
2, 7, 37, 1297
OFFSET
1,1
COMMENTS
No other terms for k < 3000. - T. D. Noe, Apr 25 2012
Apart from the first term, the exponents must be powers of two. Like Fermat primes, there are probably only finitely many terms. No more terms for k < 2^28 = 268435456. - Charles R Greathouse IV, Jul 16 2012
MATHEMATICA
Select[Table[6^n + 1, {n, 0, 100}], PrimeQ] (* T. D. Noe, Apr 25 2012 *)
PROG
(PFGW) ABC2 6^(2^$a)+1
a: from 0 to 18
// Charles R Greathouse IV, Jul 16 2012
CROSSREFS
Sequence in context: A195068 A342412 A196916 * A173762 A180269 A036432
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Apr 25 2012
STATUS
approved