A125706 Numbers n such that 6^n + 3^n + 2^n = A074528(n) is a prime.

0, 1, 3, 9, 13, 25, 27, 29, 95, 107, 153, 159, 675, 1633, 1693, 2337, 25998

Offset

1,3

Comments

Corresponding primes of the form 6^n + 3^n + 2^n are {3, 11, 251, 10097891, 13062296531, 28430288877251865251, 1023490376703200952251, 36845653355419807219091, 84017312692910353150294530243640676594723260464784043666542128557055486251, ...}.

Links

Table of n, a(n) for n=1..17.

Mathematica

Do[f=6^n+3^n+2^n; If[PrimeQ[f], Print[{n, f}]], {n, 1, 675}]

Crossrefs

Cf. A074528.

Sequence in context: A126827 A363628 A106402 * A113510 A163795 A079994

Adjacent sequences: A125703 A125704 A125705 * A125707 A125708 A125709

Keyword

hard,more,nonn

Author

Alexander Adamchuk, Jan 31 2007

Extensions

More terms from Ryan Propper, Mar 30 2007

Status

approved