[seqfan] Re: oeis.org/search?q=2014,3,14

[Giovanni Resta]

On 03/10/2014 03:16 AM, M. F. Hasler wrote:
> ...  This
> led to a search for composite numbers which have all their divisors as
> substring in their decimal expansion. Charles Greathouse found the
> second such number (after 125) to be A239058(870356)=17692313, the
> next larger one is still unknown!

I have tested up to 10^11 without finding a(4).

I also searched for semiprimes like 17692313.

I've found 28 further examples of the form
p*q, with p < 50000 and q < 10^100,
the two smallest being:

54761636107193237 = 719 * 76163610719323
and
112988699831147753 = 8699 * 12988699831147.

I've submitted these terms as  a-file.

Giovanni