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A177848 as a simple table

na(n)
11
21
31
41
53
61
71
855
955
101
111
121993
1312073
141993
151
161
17120841
187983241
197983241
20120841
211
221
2311404081
2412454040881
25149448498481
2612454040881
2711404081
281
291
301556750161
3138109367290961
328688935743482961
338688935743482961
3438109367290961
351556750161
361

[1,1,1,1,3,1,1,55,55,1,1,1993,12073,1993,1,1,
 120841,7983241,7983241,120841,1,1,11404081,
 12454040881,149448498481,12454040881,11404081,1,1,
 1556750161,38109367290961,8688935743482961,
 8688935743482961,38109367290961,1556750161,1]