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A135972
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Nonprime numbers of the form 2^n-1.
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1
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0, 1, 15, 63, 255, 511, 1023, 2047, 4095, 16383, 32767, 65535, 262143, 1048575, 2097151, 4194303, 8388607, 16777215, 33554431, 67108863, 134217727, 268435455, 536870911, 1073741823, 4294967295, 8589934591, 17179869183, 34359738367
(list; graph; refs; listen; history; internal format)
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