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A117004 Sigma(n) - A079667(n). 2
1, 2, 2, 4, 2, 6, 2, 6, 5, 6, 2, 12, 2, 6, 8, 10, 2, 12, 2, 14, 8, 6, 2, 20, 7, 6, 8, 14, 2, 22, 2, 14, 8, 6, 12, 26, 2, 6, 8, 24, 2, 24, 2, 14, 18, 6, 2, 32, 9, 16, 8, 14, 2, 24, 12, 28, 8, 6, 2, 42, 2, 6, 22, 22, 12, 24, 2, 14, 8, 30, 2, 48, 2, 6, 18, 14, 16, 24, 2, 40, 17, 6, 2, 46, 12, 6, 8, 30 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

H. J. S. Smith, Report on the Theory of Numbers, reprinted in Vol. 1 of his Collected Math. Papers, Chelsea, NY, 1979, see p. 322.

LINKS

Table of n, a(n) for n=1..88.

FORMULA

G.f.: sum(n>=1, n*x^(n^2)*(1+x^n)/(1-x^n) ). [Joerg Arndt, Jan 30 2011]

CROSSREFS

Cf. A000203, A079667.

Sequence in context: A140635 A002322 A127835 * A128982 A096216 A121599

Adjacent sequences:  A117001 A117002 A117003 * A117005 A117006 A117007

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 15 2006

STATUS

approved

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Last modified August 20 16:20 EDT 2014. Contains 245799 sequences.