[seqfan] Odd squarefree numbers

[zak seidov]

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