A157968 - OEIS

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A157968

2^n - 1 (A000225) where n is nonprime number (A141468).

0, 1, 15, 63, 127, 255, 511, 1023, 4095, 16383, 32767, 65535, 262143, 1048575, 2097151, 4194303, 16777215, 33554431, 67108863, 134217727, 268435455, 1073741823, 4294967295 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	COMMENTS	`a(0) = 0 since 2^0 - 1 = 0 and 0 is nonprime, a(1) = 1 since 2^1 - 1 = 1 and 1 is nonprime, a(2) = 15 since 2^4 - 1 = 15 and 4 is nonprime, ...`
	LINKS	`Table of n, a(n) for n=0..22.`
	CROSSREFS	`A000668` `Sequence in context: A066584 A065915 A062965 * A141759 A104473 A135972` `Adjacent sequences: A157965 A157966 A157967 * A157969 A157970 A157971`
	KEYWORD	`nonn`
	AUTHOR	`Jani Melik, Mar 10 2009`
	STATUS	`approved`

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Last modified May 25 08:56 EDT 2013. Contains 225646 sequences.