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A283844 as a simple table

na(n)
13
25
313
433
5105
6345
71173
84097
914573
1052433
11190653
12699073
132581113
149586985
1535791473
16134217729
17505290273
181908874585
197233629133
2027487790721
21104715393913
22399822410105
231529755308213
245864062017537
2522517998136937
2686607685141745

[3,5,13,33,105,345,1173,4097,14573,52433,190653,
 699073,2581113,9586985,35791473,134217729,
 505290273,1908874585,7233629133,27487790721,
 104715393913,399822410105,1529755308213,
 5864062017537,22517998136937,86607685141745]