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Numbers n such that 16^n + 1 is a semiprime.
1

%I #32 Aug 03 2014 14:27:53

%S 3,5,7,8,10,16,23,26,32,37,64,89,149,173,251,307,317,956,30197,46058

%N Numbers n such that 16^n + 1 is a semiprime.

%t Select[Range[37], PrimeOmega[16^# + 1] == 2 &] (* _Arkadiusz Wesolowski_, Dec 15 2011 *)

%Y Cf. A002590, A057182, A127317.

%K nonn

%O 1,1

%A _Arkadiusz Wesolowski_, Oct 19 2011