Smallest number that contains the numbers from 1 to n as substrings.
1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 1023456789
1 seqfan posts
Tue May 25 01:32:46 CEST 2010 [seqfan] Smallest number that contains the first n semiprimes as substrings