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A064060 as a simple table

na(n)
21
31
41
53
61
710
815
91
1010
1115
1215
1345
1460
1590
161
1721
1835
1970
20105
21105
22105
23105
24210
25315
26420
27630
28630
291
3028
3135
3256
33105
34168
35210
36210
37280
38280
39280
40315
41420
42420
43560
44560
45840
46840
47840
481260
491260

[1,1,1,3,1,10,15,1,10,15,15,45,60,90,1,21,35,70,
 105,105,105,105,210,315,420,630,630,1,28,35,56,
 105,168,210,210,280,280,280,315,420,420,560,560,
 840,840,840,1260,1260]