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A146474 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
139
149
1523
1623
1785
1885
19375
20375
212149
222149
2315299
2415299
25129877
26129877
271353943
281353943
2917475557
3017475557

[1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,85,85,375,375,
 2149,2149,15299,15299,129877,129877,1353943,
 1353943,17475557,17475557]