A128997 - OEIS

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A128997

indices k such that A063670(k) differs from A005420(k).

11, 12, 15, 20, 21, 22, 23, 24, 25, 28, 29, 30, 33, 35, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Primes in this sequence are those for which A005420(n) < 2^n-1, i.e. 2^n-1 is not prime.`
	PROG	`(PARI) t=1; vector(100, i, until( A063670(t++) != A005420(t), ); t)`
	CROSSREFS	`Cf. A005420, A063670.` `Sequence in context: A034907 A045987 A121978 * A189836 A139138 A113600` `Adjacent sequences: A128994 A128995 A128996 * A128998 A128999 A129000`
	KEYWORD	`nonn`
	AUTHOR	`M. F. Hasler (maximilian.hasler(AT)gmail.com), Apr 30 2007`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.