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A137847 as a simple table

na(n)
12
23
33
43
55
65
75
85
95
107
117
127
137
1411
1511
1611
1711
1811
1911
2013
2113
2213
2313
2413
2513
2613
2713
2817
2917
3017
3117
3217
3319
3419
3519
3619
3723
3823
3923
4023
4123
4223
4329
4429
4529
4629
4729
4829
4929
5029
5129
5229
5329
5429
5529
5629
5731
5831
5931
6031
6137
6237
6337
6437
6537
6637
6741
6841
6941
7041
7141
7241
7341
7443

[2,3,3,3,5,5,5,5,5,7,7,7,7,11,11,11,11,11,11,13,
 13,13,13,13,13,13,13,17,17,17,17,17,19,19,19,19,
 23,23,23,23,23,23,29,29,29,29,29,29,29,29,29,29,
 29,29,29,29,31,31,31,31,37,37,37,37,37,37,41,41,
 41,41,41,41,41,43]