id:A076360 - OEIS Search Results

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a(n)=Commutator[sigma,tau](n)=d0[d1[w]]-d1[d0[w]], where d0()=number of, d1()=sum of divisors of n.

+0
6

0, -1, 0, -2, 1, -1, 1, -3, -2, -1, 3, -6, 1, 1, 1, -4, 3, -8, 3, -4, -1, 2, 5, -3, -2, 1, 1, -4, 5, -3, 3, -6, 3, 1, 3, -9, 1, 5, 1, -3, 5, -3, 3, 0, -4, 5, 7, -12, 0, -8, 5, -6, 5, 1, 5, 1, 3, 5, 9, -12, 1, 5, -4, -6, 5, 0, 3, 0, 5, 0, 9, -20, 1, 1, -6, 0, 5, 1, 7, -10, -3, 5, 9, -16, 5, 5, 9, 3, 9, -16, 3, 4, 1, 8, 9, -10, 3, -6, 0, -9, 5, 1, 5, 1, -1 (list; graph; listen)

	OFFSET	`1,4`
	MATHEMATICA	`d0[x_] := DivisorSigma[0, x] d1[x_] := DivisorSigma[1, x] Table[d0[d1[w]]-d1[d0[w]], {w, 1, 128}]`
	CROSSREFS	`Cf. A000005, A000203.` `Sequence in context: A136565 A086291 A016442 this_sequence A089398 A047040 A047020` `Adjacent sequences: A076357 A076358 A076359 this_sequence A076361 A076362 A076363`
	KEYWORD	`easy,sign`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Oct 08 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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