Numbers n with an even number of digits, n = d_1 d_2 ... d_n, such that there are exactly three ways to partition the digits into two groups of size n/2, say f_1 ... f_{n/2} and g_1 ... g_{n/2}, such that n = f_1 ... f_{n/2} * g_1 ... g_{n/2}.
13078260, 107650322640, 113024597400, 119634515208, 134549287600
1 seqfan posts
Mon Sep 26 18:28:28 CEST 2011 [seqfan] Re: broken links to pages from W. Schneider