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A004050 as a simple table

na(n)
12
23
34
45
57
69
710
811
913
1017
1119
1225
1328
1429
1531
1633
1735
1841
1943
2059
2165
2267
2373
2482
2583
2685
2789
2891
2997
30113
31129
32131
33137
34145
35155
36209
37244
38245
39247
40251
41257
42259
43265
44275
45283
46307
47337
48371
49499
50513
51515
52521
53539
54593
55730
56731
57733
58737
59745
60755

[2,3,4,5,7,9,10,11,13,17,19,25,28,29,31,33,35,41,
 43,59,65,67,73,82,83,85,89,91,97,113,129,131,137,
 145,155,209,244,245,247,251,257,259,265,275,283,
 307,337,371,499,513,515,521,539,593,730,731,733,
 737,745,755]