A155802 Numbers k such that (5^k + 2^k - 1)/12 is prime.

3, 5, 7, 15, 65, 105, 135, 155, 235, 249, 1407, 1745, 30207, 40407, 68115

Offset: 1

Author

Zak Seidov, Jan 27 2009

Keywords

• nonn
• more

Examples

			Corresponding primes are: 11, 263, 6521, 2543134241, 225875452601146757084886003255695202165296363, 2054325274013051576593043138757255806440645138498014683534338706479543763.
Other terms are too large to be presented.
		

Crossrefs

Cf. A155588.

Extensions

a(11)-a(15) from Michael S. Branicky, Jul 08 2025