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A147198 as a simple table

na(n)
11
21
31
41
51
61
71
81
93
103
115
125
1313
1413
1527
1627
1785
1885
19297
20297
211599
221599
237901
247901
2542229
2642229
27268975
28268975

[1,1,1,1,1,1,1,1,3,3,5,5,13,13,27,27,85,85,297,
 297,1599,1599,7901,7901,42229,42229,268975,268975]