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A084705 as a simple table

na(n)
02
12
23
32
47
53
63
72
83
923
1013
1129
123
135
147
152
1637
1753
183
1911
207
2111
2237
2371
2473
255
267
2717
2813
2923
303
31239
3243
33113
34163
3559
363
3789
38349
395
4097
413
4273
4311
4467
45101
4619
47101
4861
4923
507
5117
527
53233
54127
555
56541
5729
58103
5971
6031
6153
62109
63179
64163
6571
663

[2,2,3,2,7,3,3,2,3,23,13,29,3,5,7,2,37,53,3,11,7,
 11,37,71,73,5,7,17,13,23,3,239,43,113,163,59,3,89,
 349,5,97,3,73,11,67,101,19,101,61,23,7,17,7,233,
 127,5,541,29,103,71,31,53,109,179,163,71,3]