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A055052 as a simple table

na(n)
15
27
313
415
520
621
723
828
929
1031
1137
1239
1345
1447
1552
1653
1755
1860
1961
2063
2169
2271
2377
2479
2580
2684
2785
2887
2992
3093
3195
32101
33103
34109
35111
36112
37116
38117
39119
40124
41125
42127
43133
44135
45141
46143
47148
48149
49151
50156
51157
52159
53165
54167
55173
56175

[5,7,13,15,20,21,23,28,29,31,37,39,45,47,52,53,55,
 60,61,63,69,71,77,79,80,84,85,87,92,93,95,101,103,
 109,111,112,116,117,119,124,125,127,133,135,141,
 143,148,149,151,156,157,159,165,167,173,175]