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A241758 as a simple table

na(n)
12
25
313
45
517
617
75
817
95
105
1113
1217
135
1413
155
1617
1737
1817
195
2013
2117
2217
2329
2437
2541
265
275
2817
2913
305
3113
3217
335
3437
3541
3617
375
3873
395
4089
4113
4297
435
4413
4517
4637
4741
4829
49137
505
515
5241
535
5441
5513
56193
575
585
5917
60193
6117
6217
6337
6441
6537
6697
6753
6873
6953
705

[2,5,13,5,17,17,5,17,5,5,13,17,5,13,5,17,37,17,5,
 13,17,17,29,37,41,5,5,17,13,5,13,17,5,37,41,17,5,
 73,5,89,13,97,5,13,17,37,41,29,137,5,5,41,5,41,13,
 193,5,5,17,193,17,17,37,41,37,97,53,73,53,5]