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A068951 as a simple table

na(n)
12
23
35
47
52
65
711
85
97
1011
117
1213
1311
1417
152
165
175
1811
1913
207
2113
2211
2317
2411
2513
2617
2719
287
2911
3013
317
3211
3317
3411
3513
365
377
3811
397
4013
4111
4217
4313
4419
4519
465
4713
487
4911
5017
5111
5213
5317
5419
5517
5613
5719
5817
5923
607
6113
6211
6313
6417
6513
6617
6717
6813
6919
7013
7119
7217
7323
7417
7511
7613

[2,3,5,7,2,5,11,5,7,11,7,13,11,17,2,5,5,11,13,7,
 13,11,17,11,13,17,19,7,11,13,7,11,17,11,13,5,7,11,
 7,13,11,17,13,19,19,5,13,7,11,17,11,13,17,19,17,
 13,19,17,23,7,13,11,13,17,13,17,17,13,19,13,19,17,
 23,17,11,13]