a(n) = the smallest positive integer not yet occurring such that the number of divisors of 1+sum{k=1 to n} a(k) is exactly n.
1, 2, 4, 8, 12, 36, 6, 30, 62, 862, 11, 3061, 4096, 8192, 17, 49135, 60, 196548, 48
1 seqfan posts
Thu May 6 15:11:21 CEST 2010 [seqfan] Re: Is it certain that this is a permutation?