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A257699 as a simple table

na(n)
12
21
37
43
55
62
76
88
910
104
1114
124
136
146
1510
163
175
187
1913
209
2111
229
2313
2411
2513
265
2713
2815
2917
305
319
325
337
347
3513
367
379
3811
3915
404
416
424
4318
446
458
468
4712
4814
4916
5010
5116
5210
5312
5412
5516
5610
5712
5814
5922
6012
6114
6212
6316
6414
6516
666
6712
6814
6916
7016
7120
7216
7318

[2,1,7,3,5,2,6,8,10,4,14,4,6,6,10,3,5,7,13,9,11,9,
 13,11,13,5,13,15,17,5,9,5,7,7,13,7,9,11,15,4,6,4,
 18,6,8,8,12,14,16,10,16,10,12,12,16,10,12,14,22,
 12,14,12,16,14,16,6,12,14,16,16,20,16,18]