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A370857 as a simple table

na(n)
11
21
31
41
53
61
77
89
919
1013
1155
1221
13131
14157
15303
16317
171039
18393
192471
202505
215643
226145
2319235
247413
2540235
2651905
27110435
28110683
29359141
3045877
31764159
321077437
332253143
342251065
356699111
362200709
3716009783
3820505321
3943172899
4029699143
41125396929

[1,1,1,1,3,1,7,9,19,13,55,21,131,157,303,317,1039,
 393,2471,2505,5643,6145,19235,7413,40235,51905,
 110435,110683,359141,45877,764159,1077437,2253143,
 2251065,6699111,2200709,16009783,20505321,
 43172899,29699143,125396929]