A132927 Concatenation of first n elements of the divisor function d(n), where d(n) is the number of divisors of n.

1, 12, 122, 1223, 12232, 122324, 1223242, 12232424, 122324243, 1223242434, 12232424342, 122324243426, 1223242434262, 12232424342624, 122324243426244, 1223242434262445, 12232424342624452, 122324243426244526

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Mathematica

With[{c=DivisorSigma[0, Range[30]]}, Table[FromDigits[Take[c, n]], {n, 20}]] (* Harvey P. Dale, Jul 13 2012 *)

Crossrefs

d(n): A000005. Cf. A007908, A019518.

Sequence in context: A037551 A134584 A090843 * A113574 A255307 A199592

Adjacent sequences: A132924 A132925 A132926 * A132928 A132929 A132930

Keyword

easy,nonn,base

Author

Omar E. Pol, Sep 05 2007

Status

approved