A190121 - OEIS

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A190121

Partial sums of the arithmetic derivative function A003415.

0, 1, 2, 6, 7, 12, 13, 25, 31, 38, 39, 55, 56, 65, 73, 105, 106, 127, 128, 152, 162, 175, 176, 220, 230, 245, 272, 304, 305, 336, 337, 417, 431, 450, 462, 522, 523, 544, 560, 628, 629, 670, 671, 719, 758, 783, 784, 896, 910, 955, 975, 1031, 1032, 1113, 1129 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	LINKS	`Table of n, a(n) for n=1..55.`
	EXAMPLE	`1'+2'+3'+4'+5'=0+1+1+4+1=7->a(5)=7`
	MAPLE	`der:=n->n*add(op(2, p)/op(1, p), p=ifactors(n)[2]):` `seq(add(der(i), i=1..j), j=1..100);`
	CROSSREFS	`Cf. A003415.` `Sequence in context: A217575 A172154 A072147 * A105329 A124319 A078471` `Adjacent sequences: A190118 A190119 A190120 * A190122 A190123 A190124`
	KEYWORD	`nonn`
	AUTHOR	`Giorgio Balzarotti, May 04 2011`
	STATUS	`approved`

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Last modified May 21 08:52 EDT 2013. Contains 225478 sequences.