id:A051612 - OEIS Search Results

Search: id:A051612

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sigma(n) - phi(n).

+0
13

0, 2, 2, 5, 2, 10, 2, 11, 7, 14, 2, 24, 2, 18, 16, 23, 2, 33, 2, 34, 20, 26, 2, 52, 11, 30, 22, 44, 2, 64, 2, 47, 28, 38, 24, 79, 2, 42, 32, 74, 2, 84, 2, 64, 54, 50, 2, 108, 15, 73, 40, 74, 2, 102, 32, 96, 44, 62, 2, 152, 2, 66, 68, 95, 36, 124, 2, 94, 52, 120, 2, 171, 2, 78 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`sigma(4) = 7, phi(4)=2, so a(2)=7-2=5.` `a(4) = sigma(4) - phi(4) = 7-2 = 5.`
	CROSSREFS	`Cf. A000010, A000203.` `Cf. A110085, A110086, A110087.` `Sequence in context: A029603 A025124 A030996 this_sequence A083456 A068058 A144943` `Adjacent sequences: A051609 A051610 A051611 this_sequence A051613 A051614 A051615`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (j.mccranie(AT)comcast.net)`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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