A132930 Concatenation of first n elements of the sigma function, where sigma(n) is the sum of divisors of n.

1, 13, 134, 1347, 13476, 1347612, 13476128, 1347612815, 134761281513, 13476128151318, 1347612815131812, 134761281513181228, 13476128151318122814, 1347612815131812281424, 134761281513181228142424

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Crossrefs

Sigma function: A000203. Cf. A007908, A019518.

Sequence in context: A297335 A262572 A132935 * A130774 A179619 A019519

Adjacent sequences: A132927 A132928 A132929 * A132931 A132932 A132933

Keyword

easy,nonn,base

Author

Omar E. Pol, Sep 05 2007

Status

approved