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A281793 as a simple table

na(n)
01
12
25
35
417
513
637
75
813
941
10101
1161
1229
1317
14197
15113
16257
1729
1819
19181
20401
2117
2297
2353
24577
25313
26677
2773
28157
29421
3053
3137
3241
33109
3489
35613
361297
37137
3817
39761
401601
4129
42353
4337
44149
451013
4673
4717
48461
491201
5061
511301
52541
53281
542917
5589
563137
5729

[1,2,5,5,17,13,37,5,13,41,101,61,29,17,197,113,
 257,29,19,181,401,17,97,53,577,313,677,73,157,421,
 53,37,41,109,89,613,1297,137,17,761,1601,29,353,
 37,149,1013,73,17,461,1201,61,1301,541,281,2917,
 89,3137,29]