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A090748 Numbers n such that 2^(n+1) - 1 is prime. +0
19
1, 2, 4, 6, 12, 16, 18, 30, 60, 88, 106, 126, 520, 606, 1278, 2202, 2280, 3216, 4252, 4422, 9688, 9940, 11212, 19936, 21700, 23208, 44496, 86242, 110502, 132048, 216090, 756838, 859432, 1257786, 1398268, 2976220, 3021376, 6972592, 13466916 (list; graph; listen)
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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