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A065988 as a simple table

na(n)
10
20
32
43
52
65
73
87
95
105
117
1211
133
1413
1511
165
1713
1817
195
2019
2117
2213
2319
2423
257
2617
2723
2819
297
3029
3111
3231
3329
3417
3531
367
3711
3837
3923
4031
4137
4241
4317
4443
4541
4637
4743
4847
497
5041
5147
5243
5337
5453
5523
5647
5753
5829
5943
6059
6119
6261
6359
6411
6561
6641
6729
6867
6953
7061
7167
7271
7337
7473
7571

[0,0,2,3,2,5,3,7,5,5,7,11,3,13,11,5,13,17,5,19,17,
 13,19,23,7,17,23,19,7,29,11,31,29,17,31,7,11,37,
 23,31,37,41,17,43,41,37,43,47,7,41,47,43,37,53,23,
 47,53,29,43,59,19,61,59,11,61,41,29,67,53,61,67,
 71,37,73,71]