[seqfan] Re: A158911

[Peter Pein]

Am Tue, 24 Aug 2010 17:05:22 -0300
schrieb Claudio Meller <claudiomeller at gmail.com>:

> Hi,
> 
> In http://www.research.att.com/~njas/sequences/A158911
> (Numbers n such that 10^n divided thru the number of digits of 10^n
> is an integer.)
> are 124, 249, 299, 624, 999,1249, 1549, 2499,3999, 4999 and 7999
> terms of A158911?

Hi, I know this is an old thread but if there has been a clear answer
to your question (without searching in large lists), I did not see it.

Using Mathematica i get

Complement[
 {124, 249, 299, 624, 999, 1249, 1549, 2499, 3999, 4999 , 7999}, 
  Select[Range[0, 11000], PowerMod[10, #, # + 1] === 0 &]]

--> {299, 1549}

so all of your numbers but 299 and 1549 are in A158911 (if Mathematica
is right).

Cheers,
Peter