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A072816 as a simple table

na(n)
11
24
33
47
52
66
77
87
911
1019
119
128
1323
147
1519
166
1717
1849
1921
2029
2119
2231
2313
2429
254
2619
2729
287
2917
3013
3119
3231
333
3423
3517
3619
3727
3826
3923
4047
4117
427
4323
4429
4522
4626
4717
4829
4951
5059
5129
5217
5326
5422
5518
5623
577
5817
5947
6023
6121
6216
6319
6417
6523
666
6749
6819
6913
7017
717
7229
7319
7447
7529
7613

[1,4,3,7,2,6,7,7,11,19,9,8,23,7,19,6,17,49,21,29,
 19,31,13,29,4,19,29,7,17,13,19,31,3,23,17,19,27,
 26,23,47,17,7,23,29,22,26,17,29,51,59,29,17,26,22,
 18,23,7,17,47,23,21,16,19,17,23,6,49,19,13,17,7,
 29,19,47,29,13]