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A280467 as a simple table

na(n)
01
13
23
315
43
57
611
731
835
939
10235
11895
123843
1312551
14523
1531
1635
1739
18235
19895
20771
213335
227691
238223
2424611
2540999
2682155
27181119
28295683
29855303
301981963
312375711
326848547
3315794215
3419005675
3554788991
36125829891
37134221063
38402660875
39939532319

[1,3,3,15,3,7,11,31,35,39,235,895,3843,12551,523,
 31,35,39,235,895,771,3335,7691,8223,24611,40999,
 82155,181119,295683,855303,1981963,2375711,
 6848547,15794215,19005675,54788991,125829891,
 134221063,402660875,939532319]