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A069972 Sum_{d|2*n,d+1|2*n} d. 0
1, 1, 3, 1, 1, 6, 1, 1, 3, 5, 1, 6, 1, 1, 8, 1, 1, 6, 1, 5, 9, 1, 1, 6, 1, 1, 3, 8, 1, 15, 1, 1, 3, 1, 1, 14, 1, 1, 3, 5, 1, 12, 1, 1, 17, 1, 1, 6, 1, 5, 3, 1, 1, 6, 11, 8, 3, 1, 1, 15, 1, 1, 9, 1, 1, 17, 1, 1, 3, 5, 1, 14, 1, 1, 8, 1, 1, 18, 1, 5, 3, 1, 1, 19, 1, 1, 3, 1, 1, 24, 14, 1, 3, 1, 1, 6, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..98.

FORMULA

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

CROSSREFS

Cf. A007862.

Sequence in context: A273167 A324284 A300791 * A115017 A088439 A162315

Adjacent sequences:  A069969 A069970 A069971 * A069973 A069974 A069975

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Apr 29 2002

STATUS

approved

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Last modified April 4 07:32 EDT 2020. Contains 333213 sequences. (Running on oeis4.)