%I #2 Mar 30 2012 17:30:27
%S 90,96,126,140,146,234,242,272,296,374,392,410,422,434,476,492,500,
%T 522,570,572,614,620,626,636,734,762,786,812,824,920,972,990,1014,
%U 1032,1056,1062,1064,1104,1130,1176,1196,1206,1236,1260,1364,1410,1412,1424
%N n*M31 - 1 is prime, where M31 = 2^31 - 1.
%t Select[ Range[ 0, 2500, 2 ], PrimeQ[ #(2^31 - 1) - 1 ] & ]
%K nonn
%O 1,1
%A _Robert G. Wilson v_, Sep 08 2000