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A138290 Numbers n such that 2^(n+1)-2^k-1 is composite for all 0 <= k < n. +0
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6, 14, 22, 26, 30, 36, 38, 42, 54, 57, 62, 70, 78, 81, 90, 94, 110, 122, 126, 132, 134, 138, 142, 147, 150, 158, 166, 168, 171, 172, 174, 178, 182, 190, 194, 198, 206, 210, 222, 238, 254, 285, 294, 312, 315, 318, 334, 336, 350, 366, 372, 382, 405, 414, 416, 432 (list; graph; listen)
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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