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A256787 as a simple table

na(n)
01
15
23
35
415
59
65
75
89
911
1011
1145
125
1315
1423
1535
169
1759
1815
195
203
219
2235
2327
2423
2517
2651
275
2829
2927
3053
319
329
339
3423
3539
3623
375
3829
39249
409
4151
425
4375
4451
45117
4629
4777
48131
49219
50221
5129
5253
53105
54321
5595
56179
57197
58101
5951
6081
61101
6211
635
6421
65221
6653

[1,5,3,5,15,9,5,5,9,11,11,45,5,15,23,35,9,59,15,5,
 3,9,35,27,23,17,51,5,29,27,53,9,9,9,23,39,23,5,29,
 249,9,51,5,75,51,117,29,77,131,219,221,29,53,105,
 321,95,179,197,101,51,81,101,11,5,21,221,53]