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%I #4 Oct 02 2013 15:12:54
%S 0,1,3,9,13,25,27,29,95,107,153,159,675,1633,1693,2337,25998
%N Numbers n such that 6^n + 3^n + 2^n = A074528(n) is a prime.
%C Corresponding primes of the form 6^n + 3^n + 2^n are {3, 11, 251, 10097891, 13062296531, 28430288877251865251, 1023490376703200952251, 36845653355419807219091, 84017312692910353150294530243640676594723260464784043666542128557055486251, ...}.
%t Do[f=6^n+3^n+2^n;If[PrimeQ[f],Print[{n,f}]],{n,1,675}]
%Y Cf. A074528.
%K hard,more,nonn
%O 1,3
%A _Alexander Adamchuk_, Jan 31 2007
%E More terms from _Ryan Propper_, Mar 30 2007
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