id:A113521 - OEIS Search Results

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a(n) = largest nonprime nonnegative integer < c(n) which is coprime to c(n), where c(n) is the n-th composite positive integer.

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1, 1, 1, 8, 9, 1, 9, 14, 15, 1, 9, 20, 21, 1, 24, 25, 26, 27, 1, 27, 32, 33, 34, 35, 35, 38, 39, 25, 39, 44, 45, 35, 48, 49, 50, 51, 49, 54, 55, 56, 57, 49, 57, 62, 63, 64, 65, 65, 68, 69, 65, 69, 74, 75, 76, 77, 77, 80, 81, 65, 84, 85, 86, 87, 77, 90, 91, 92, 93, 94, 95, 95, 98 (list; graph; listen)

	OFFSET	`1,4`
	LINKS	`Lior Manor (lior.manor(AT)gmail.com), Nov 21 2007, Table of n, a(n) for n = 1..255` `Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`a(7) = 9 because 9 is the largest nonprime integer < 14 (the 7th composite) (since the other nonprime integers > 9 and < 14 {10 and 12} aren't coprime with 14).`
	CROSSREFS	`Cf. A002808.` `Sequence in context: A155553 A053463 A073636 this_sequence A030167 A010767 A064734` `Adjacent sequences: A113518 A113519 A113520 this_sequence A113522 A113523 A113524`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet Jan 12 2006`
	EXTENSIONS	`More terms from Lior Manor (lior.manor(AT)gmail.com), Nov 21 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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