a(0) = 1; for n > 0, a(n) = smallest positive integer whose prime signature contains, for k = 1 to n, exactly one positive number appearing exactly k times.
1, 2, 60, 1801800, 11657093261814000, 7167827541370578634694420017740000
1 seqfan posts
Sat Jan 8 20:58:17 CET 2011 [seqfan] Re: conjectured list of divisibility sequences