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A131990 as a simple table

na(n)
13
22
33
46
55
62
74
85
97
109
114
128
136
142
153
168
178
1814
196
2010
215
224
234
247
256
265
2715
2811
2915
302
314
328
3310
3412
354
3611
378
3815
394
407
416
4218
436
445
4511
4610
474
4810
498
5011
515
5210
534
545
556
5611
5723
5825
595
6014
618
622
636
6414
6512
6630
6710
688
6914
7012
714
729
7310
7419
7522
7617
7714
7812
796
806
8127
827
8314
8410
854
8611
878

[3,2,3,6,5,2,4,5,7,9,4,8,6,2,3,8,8,14,6,10,5,4,4,
 7,6,5,15,11,15,2,4,8,10,12,4,11,8,15,4,7,6,18,6,5,
 11,10,4,10,8,11,5,10,4,5,6,11,23,25,5,14,8,2,6,14,
 12,30,10,8,14,12,4,9,10,19,22,17,14,12,6,6,27,7,
 14,10,4,11,8]