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A027761 as a simple table

na(n)
15
231
341
431
561
63421
75
8557
9821
10371
11121
123421
135
14929
1515745
16557
175
182557843
195
2015541
211805
22743
23241
2460887
2561
261673
27821
28929
29301
3079085411
315
32557
3366961
3431
354397
36188641729
375
3831
393281
40277727
41421
424462547
435
4466817
45313477
461487
475
485952449

[5,31,41,31,61,3421,5,557,821,371,121,3421,5,929,
 15745,557,5,2557843,5,15541,1805,743,241,60887,61,
 1673,821,929,301,79085411,5,557,66961,31,4397,
 188641729,5,31,3281,277727,421,4462547,5,66817,
 313477,1487,5,5952449]