id:A122984 - OEIS Search Results

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Smallest positive composite number, relatively prime to n, such that a(n)+n is also composite.

+0
3

8, 25, 22, 21, 4, 49, 8, 25, 16, 39, 4, 65, 8, 25, 34, 9, 4, 77, 6, 49, 4, 27, 4, 25, 8, 9, 8, 27, 4, 91, 4, 25, 16, 15, 4, 49, 8, 25, 10, 9, 4, 143, 6, 21, 4, 9, 4, 77, 6, 27, 4, 25, 4, 65, 8, 9, 8, 27, 4, 143, 4, 15, 22, 21, 4, 25, 8, 9, 8, 51, 4, 49, 4, 21, 16, 9, 4, 55, 6, 39, 4, 9, 4, 85 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Does not include every composite number; in particular, 12 is not present. If a(n) = 12, gcd(n,12) = 1, but then one of n+4 and n+8 is divisible by 3.`
	CROSSREFS	`Equals A122985(n) - n. Cf. A096076.` `Sequence in context: A076444 A023056 A103954 this_sequence A045860 A081504 A030796` `Adjacent sequences: A122981 A122982 A122983 this_sequence A122985 A122986 A122987`
	KEYWORD	`easy,nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 22 2006`

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

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