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A138306 as a simple table

na(n)
10
20
30
45
57
67
70
80
911
1013
1117
1213
130
1417
1523
1619
1723
180
190
2023
2123
2231
2343
2429
2537
2641
2737
2837
2941
3041
3143
320
3347
3461
3541
3643
3767
3847
3947
4067
4159
4253
4373
4447
4547
4661
4753
4859
4967
500
5159
5261
5359
5467
5597
5689
5797
5879
5971
6061
6179
6271
6373
6467
6571
6671
6797
6883
6971
70137
71113
720
73103
7489

[0,0,0,5,7,7,0,0,11,13,17,13,0,17,23,19,23,0,0,23,
 23,31,43,29,37,41,37,37,41,41,43,0,47,61,41,43,67,
 47,47,67,59,53,73,47,47,61,53,59,67,0,59,61,59,67,
 97,89,97,79,71,61,79,71,73,67,71,71,97,83,71,137,
 113,0,103,89]