1. a(n) = 10^n-th odd squarefree number n, a(n) 0,1 1,21 2,241 3,2463 4,24671 5,246745 6,2467401 7,24674017 8,246740209 9,2467401073 2. More terms? 3. a(n)/10^n at n->oo = (Pi/2)^2 = 2.4674011002723? Thanks, Zak