A120416 - OEIS

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A120416

Numbers n such that n^2+1 divides n!.

18, 21, 38, 43, 47, 57, 68, 70, 72, 73, 83, 99, 111, 117, 119, 123, 128, 132, 133, 142, 157, 172, 173, 174, 182, 185, 191, 192, 193, 200, 211, 212, 216, 233, 237, 239, 242, 251, 253, 255, 265, 268, 273, 278, 293, 294, 302, 305, 307, 313, 319, 322, 327, 336 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`Hojoo Lee, Problems in elementary number theory, Problem A 26`
	FORMULA	`A002522(n) \| A000142(n)`
	EXAMPLE	`For the first number, n=18: 18^2+1=325 divides 18!=6402373705728000`
	CROSSREFS	`Sequence in context: A001101 A088341 A105145 * A090891 A121851 A154151` `Adjacent sequences: A120413 A120414 A120415 * A120417 A120418 A120419`
	KEYWORD	`easy,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 07 2006`

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Last modified February 15 17:13 EST 2012. Contains 205828 sequences.