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A347840 as a simple table

na(n)
11
23
31
47
59
611
73
815
917
1019
111
1223
1325
1427
157
1631
1733
1835
199
2039
2141
2243
2311
2447
2549
2651
273
2855
2957
3059
3115
3263
3365
3467
3517
3671
3773
3875
3919
4079
4181
4283
431
4487
4589
4691
4723
4895
4997
5099
5125
52103
53105
54107
5527
56111
57113
58115
597
60119
61121

[1,3,1,7,9,11,3,15,17,19,1,23,25,27,7,31,33,35,9,
 39,41,43,11,47,49,51,3,55,57,59,15,63,65,67,17,71,
 73,75,19,79,81,83,1,87,89,91,23,95,97,99,25,103,
 105,107,27,111,113,115,7,119,121]