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A086156 a(n)=sigma[n*n]-n*sigma[n]. 0
0, 1, 1, 3, 1, 19, 1, 7, 4, 37, 1, 67, 1, 63, 43, 15, 1, 145, 1, 121, 69, 139, 1, 211, 6, 189, 13, 199, 1, 661, 1, 31, 145, 313, 87, 475, 1, 387, 195, 337, 1, 1155, 1, 427, 241, 559, 1, 691, 8, 817, 319, 577, 1, 1171, 163, 519, 393, 877, 1, 2413, 1, 999, 345, 63, 213, 2599 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

MATHEMATICA

Table[DivisorSigma[1, w*w]-w*DivisorSigma[1, w], {w, 1, 256}]

CROSSREFS

Cf. A000203, A000593, A046913.

Sequence in context: A051238 A120984 A016480 * A188109 A147076 A027537

Adjacent sequences:  A086153 A086154 A086155 * A086157 A086158 A086159

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Aug 14 2003

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.