id:A076721 - OEIS Search Results

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Difference between product of divisors of n and sum of divisors of n.

+0
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0, -1, -1, 1, -1, 24, -1, 49, 14, 82, -1, 1700, -1, 172, 201, 993, -1, 5793, -1, 7958, 409, 448, -1, 331716, 94, 634, 689, 21896, -1, 809928, -1, 32705, 1041, 1102, 1177, 10077605, -1, 1384, 1465, 2559910, -1, 3111600, -1, 85100, 91047, 2044, -1, 254803844, 286, 124907 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`a(p)=-1 iff p is a prime.`
	MATHEMATICA	`Table[d = Divisors[n]; Apply[Times, d] - Apply[Plus, d], {n, 1, 50}]`
	CROSSREFS	`Equals A007955 - A000203.` `Sequence in context: A097190 A103903 A040599 this_sequence A090215 A040570 A040569` `Adjacent sequences: A076718 A076719 A076720 this_sequence A076722 A076723 A076724`
	KEYWORD	`sign`
	AUTHOR	`Emrehan Halici (emrehan(AT)halici.com.tr), Oct 27 2002`
	EXTENSIONS	`Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 29 2002`

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

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