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A155802 Numbers n with property that (5^n + 2^n - 1)/12 is prime. 0
3, 5, 7, 15, 65, 105, 135, 155, 235, 249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

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.

Sequence in context: A217615 A050553 A005540 * A080741 A247356 A073436

Adjacent sequences:  A155799 A155800 A155801 * A155803 A155804 A155805

KEYWORD

nonn

AUTHOR

Zak Seidov, Jan 27 2009

STATUS

approved

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Last modified February 22 04:58 EST 2020. Contains 332115 sequences. (Running on oeis4.)