id:A053021 - OEIS Search Results

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Divisor function applied twice to n!.

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1, 2, 3, 4, 5, 8, 12, 12, 12, 16, 24, 24, 30, 30, 42, 36, 40, 48, 56, 80, 48, 72, 80, 112, 112, 144, 120, 216, 252, 168, 189, 168, 80, 224, 168, 288, 320, 121, 192, 440, 480, 384, 408, 624, 792, 864, 960, 1152, 864, 728, 504, 780, 840, 1080, 960, 840, 972 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`d[ d[ n! ] ]=A010553(n!)=A000005(A027473(n))`
	EXAMPLE	`d[ [ 7! ] ]=d[ d[ 8! ] ]=d[ 60 ]=d[ 96 ]=12`
	CROSSREFS	`A000005, A027473, A010553.` `Sequence in context: A103262 A135318 A101137 this_sequence A122700 A048486 A065428` `Adjacent sequences: A053018 A053019 A053020 this_sequence A053022 A053023 A053024`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Feb 24 2000`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research