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A047880 as a simple table

na(n)
00
15
25
39
412
519
625
735
841
954
1063
1178
1288
13106
14118
15139
16152
17175
18191
19217
20233
21262
22281
23312
24332
25366
26388
27425
28448
29487
30513
31555
32581
33626
34655
35702
36732
37782
38814
39867
40900
41955
42991
431049
441085
451146
461185
471248
481288

[0,5,5,9,12,19,25,35,41,54,63,78,88,106,118,139,
 152,175,191,217,233,262,281,312,332,366,388,425,
 448,487,513,555,581,626,655,702,732,782,814,867,
 900,955,991,1049,1085,1146,1185,1248,1288]