A128920 Sum of all the factors in all the ways to write n as n = x*y*z with 1 <= x <= y <= z <= n.

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

Offset

1,1

Links

Table of n, a(n) for n=1..67.

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: A319067 A224503 A349005 * A006288 A047598 A283773

Adjacent sequences: A128917 A128918 A128919 * A128921 A128922 A128923

Keyword

nonn

Author

Jose Ramon Real, Oct 23 2007

Extensions

Corrected by Charles R Greathouse IV, Sep 02 2009

Status

approved