A155802 - OEIS

A155802

Numbers n with property that (5^n + 2^n - 1)/12 is prime.

3, 5, 7, 15, 65, 105, 135, 155, 235, 249

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OFFSET

1,1

LINKS

EXAMPLE

Corresponding primes are: 11, 263, 6521, 2543134241,

225875452601146757084886003255695202165296363,

2054325274013051576593043138757255806440645138498014683534338706479543763.

Other terms are too large to be presented.

CROSSREFS

Cf. A155588 5^n+2^n-1.

KEYWORD

nonn

AUTHOR

Zak Seidov, Jan 27 2009

STATUS

approved