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A023891 Sum of composite divisors of n. +0
4
0, 0, 0, 4, 0, 6, 0, 12, 9, 10, 0, 22, 0, 14, 15, 28, 0, 33, 0, 34, 21, 22, 0, 54, 25, 26, 36, 46, 0, 61, 0, 60, 33, 34, 35, 85, 0, 38, 39, 82, 0, 83, 0, 70, 69, 46, 0, 118, 49, 85, 51, 82, 0, 114, 55, 110, 57, 58, 0, 157, 0, 62, 93, 124, 65, 127, 0, 106, 69, 129, 0 (list; graph; listen)
OFFSET

1,4

MATHEMATICA

Array[ Plus @@ (Select[ Divisors[ # ], (!PrimeQ[ # ] && #>1)& ])&, 75 ]

CROSSREFS

Cf. A000203, A035322, A035321, A060278.

Sequence in context: A085562 A037282 A075083 this_sequence A075091 A132953 A085968

Adjacent sequences: A023888 A023889 A023890 this_sequence A023892 A023893 A023894

KEYWORD

nonn

AUTHOR

Olivier Gerard (ogerard(AT)ext.jussieu.fr)

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Last modified August 29 14:50 EDT 2008. Contains 143238 sequences.


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