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Primes of the form (2^n - 1)*(2^(m+2)) + 3 where n >= 1, m >= 1.
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%I #9 Apr 16 2013 14:18:38

%S 11,19,59,67,131,227,251,499,1019,1987,4091,4099,8179,32707,32771,

%T 57347,65027,65539,114691,130051,131011,131059,262139,262147,507907,

%U 1040387,1048571,2097091,4161539,8372227,8388547,14680067,16744451,33538051,33554371,67108739,67108859,133955587

%N Primes of the form (2^n - 1)*(2^(m+2)) + 3 where n >= 1, m >= 1.

%C These are the primes arising in A224380.

%Y Cf. A224380.

%K nonn

%O 1,1

%A _Brad Clardy_, Apr 05 2013