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A147248 as a simple table

na(n)
11
21
31
41
51
61
77
89
931
1055
11549
121047
1310041
1421681
15484881
161255593
1740179283
18122480813
197136007271
2025526356825
212044413653787
228531086609057
231153670123416227
245640169181500505
251230123398597079731

[1,1,1,1,1,1,7,9,31,55,549,1047,10041,21681,
 484881,1255593,40179283,122480813,7136007271,
 25526356825,2044413653787,8531086609057,
 1153670123416227,5640169181500505,
 1230123398597079731]