id:A064938 - OEIS Search Results

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Nonprimes such that gcd(n, prime(n)^2 - 1) is n.

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1, 4, 6, 8, 10, 12, 14, 20, 24, 42, 48, 60, 63, 70, 72, 80, 84, 108, 120, 124, 126, 153, 156, 182, 240, 246, 264, 286, 327, 372, 374, 440, 492, 516, 552, 1008, 1053, 1664, 1941, 2160, 2494, 3048, 3741, 4116, 4136, 4144, 4152, 5106, 5698, 6012, 6458, 6459 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`Select[ Range[10^4], !PrimeQ[ # ] && GCD[ #, Prime[ # ]^2 - 1] == # & ]`
	CROSSREFS	`Cf. A064830.` `Sequence in context: A141109 A061344 A066664 this_sequence A050990 A020645 A051756` `Adjacent sequences: A064935 A064936 A064937 this_sequence A064939 A064940 A064941`
	KEYWORD	`easy,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 26 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research