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A078773 as a simple table

na(n)
10
20
32
42
53
62
75
83
95
103
117
123
1311
145
157
167
1713
185
1917
207
2111
227
2319
247
2519
2611
2717
2811
2923
307
3129
3213
3319
3413
3523
3611
3731
3817
3923
4013
4137
4211
4341
4419
4523
4619
4743
4813
4941
5019
5131
5223
5347
5417
5537
5623
5731
5823
5953
6013
6159
6229
6331
6431
6547
6619
6761
6831
6943
7023
7167
7223
7371
7431
7537
7631

[0,0,2,2,3,2,5,3,5,3,7,3,11,5,7,7,13,5,17,7,11,7,
 19,7,19,11,17,11,23,7,29,13,19,13,23,11,31,17,23,
 13,37,11,41,19,23,19,43,13,41,19,31,23,47,17,37,
 23,31,23,53,13,59,29,31,31,47,19,61,31,43,23,67,
 23,71,31,37,31]