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A147251 as a simple table

na(n)
11
21
31
41
51
61
71
81
93
105
1111
1217
1347
14101
15251
16493
171875
185405
1923441
2071481
21351927
221342835
237434603
2430903299
25201078705
261028625049

[1,1,1,1,1,1,1,1,3,5,11,17,47,101,251,493,1875,
 5405,23441,71481,351927,1342835,7434603,30903299,
 201078705,1028625049]