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A135972
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Nonprime numbers of the form 2^n - 1.
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6
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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
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OFFSET
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1,3
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LINKS
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MAPLE
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remove(isprime, [seq(2^n-1, n=0..100)]); # Robert Israel, Dec 28 2015
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MATHEMATICA
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k = {}; Do[If[ ! PrimeQ[2^n - 1], AppendTo[k, 2^n - 1]], {n, 1, 100}]; k
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PROG
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(PARI) lista(nn) = for (n=0, nn, if (! isprime(np = 2^n-1), print1(np, ", "))); \\ Michel Marcus, Nov 04 2013
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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