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A146970 as a simple table

na(n)
13
23
37
46
58
68
72
86
916
1012
1114
1214
136
146
1518
1618
1720
1820
192
2012
2134
2224
236
2418
2514
262
2730
2830
2932
3032
3112
3228
3318
342
3538
3638
3714
3814
3942
4042
4144
4244
432
4424
4570
4648
472
482
4918
5030
5166
5254
532
542
552
5630
5788
5860
5962
6062
612
622
6314
6414
6568
6668
6724
6824
6972
7072
7174
7274
732
742
752
7614
7792
7880
792

[3,3,7,6,8,8,2,6,16,12,14,14,6,6,18,18,20,20,2,12,
 34,24,6,18,14,2,30,30,32,32,12,28,18,2,38,38,14,
 14,42,42,44,44,2,24,70,48,2,2,18,30,66,54,2,2,2,
 30,88,60,62,62,2,2,14,14,68,68,24,24,72,72,74,74,
 2,2,2,14,92,80,2]