A138647 Primes of form (5^n+1)/6.

521, 11293772630057337854244300009061892827351888021, 6573840876841765045097738044023218580610053625908525039752324422200521, 164346021921044126127443451100580464515251340647713125993808110555013021

Offset

1,1

Links

Table of n, a(n) for n=1..4.

Mathematica

a={}; Do[x=(5^n+1)/6; If[PrimeQ[x], AppendTo[a, x]], {n, 0, 12^2}]; a
Select[(5^Range[0, 200]+1)/6, PrimeQ] (* Harvey P. Dale, Jul 18 2011 *)

Crossrefs

Sequence in context: A028484 A057699 A033525 * A045050 A305268 A004968

Adjacent sequences: A138644 A138645 A138646 * A138648 A138649 A138650

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 15 2008

Status

approved