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A128920 Sum of the all the factors of ways to write n as n = x*y*z with 1<=x<=y<=z<=n. +0
1
3, 4, 5, 11, 7, 14, 9, 23, 18, 20, 13, 38, 15, 26, 26, 46, 19, 50, 21, 54, 34, 38, 25, 83, 38, 44, 51, 70, 31, 86, 33, 88, 50, 56, 50, 136, 39, 62, 58, 119, 43, 112, 45, 102, 92, 74, 49, 181, 66, 108, 74, 118, 55, 150, 74, 155, 82, 92, 61, 233, 63, 98, 120, 185, 86, 164, 69 (list; graph; listen)
OFFSET

1,1

EXAMPLE

a(6)=14 because 6 = 6*1*1 = 3*2*1 and 6+1+1+3+2+1=14.

CROSSREFS

Cf. A034836.

Sequence in context: A136366 A123820 A133320 this_sequence A006288 A047598 A067532

Adjacent sequences: A128917 A128918 A128919 this_sequence A128921 A128922 A128923

KEYWORD

nonn

AUTHOR

Jose Ramon Real (joseramonreal(AT)yahoo.es), Oct 23 2007

EXTENSIONS

Corrected by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Sep 02 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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