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%I #5 Oct 31 2013 12:17:35
%S 2,6,12,6,42,18,66,126,144,762,78,318,1026,84,264,354,288,102,1242,
%T 162,168,318,2058,234,2352,252,2532,42,342,102,2034,2946,222,606,882,
%U 348,3366,2472,264,2988,2466,336,666,762,222,438,3432,6834,3816,588,1818
%N a(n) is the minimal k such that 5^n +/- k are primes.
%e a(1)=2 because 5^1 +/- 2 are primes; a(2)=6 because 5^2 +/- 6 are primes.
%t f[n_] := Block[{k = 2}, While[ ! PrimeQ[5^n + k] || ! PrimeQ[5^n - k], k += 2]; k]; Array[f, 51] (* _Robert G. Wilson v_ *)
%K nonn
%O 1,1
%A _Zak Seidov_, Jan 13 2006
%E Corrected and extended by _Robert G. Wilson v_, Jan 18 2006
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