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A319410
Twice A032741.
2
0, 0, 2, 2, 4, 2, 6, 2, 6, 4, 6, 2, 10, 2, 6, 6, 8, 2, 10, 2, 10, 6, 6, 2, 14, 4, 6, 6, 10, 2, 14, 2, 10, 6, 6, 6, 16, 2, 6, 6, 14, 2, 14, 2, 10, 10, 6, 2, 18, 4, 10, 6, 10, 2, 14, 6, 14, 6, 6, 2, 22, 2, 6, 10, 12, 6, 14, 2, 10, 6, 14, 2, 22, 2, 6, 10, 10, 6, 14, 2, 18, 8, 6, 2, 22, 6, 6, 6, 14, 2, 22, 6, 10, 6, 6, 6, 22, 2, 10, 10, 16
OFFSET
0,3
COMMENTS
For n>0, twice the number of proper divisors of n (d|n, d<n).
LINKS
Claude Lenormand, Deux transformations sur les mots, Preprint, 5 pages, Nov 17 2003. Apparently unpublished. This is a scanned copy of the version that the author sent to me in 2003.
CROSSREFS
Cf. A032741.
A column of the triangle in A319411.
Sequence in context: A073348 A287093 A122457 * A337174 A139770 A140635
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 20 2018
STATUS
approved