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A247081 as a simple table

na(n)
18
215
318
421
533
635
739
845
951
1055
1157
1263
1365
1469
1577
1681
1785
1887
1991
2093
2195
2299
23111
24115
25117
26119
27123
28128
29129
30133
31141
32143
33145
34147
35153
36155
37159
38161
39162
40171
41175
42177
43183
44185
45187
46201
47203
48205
49207
50209
51213
52215
53217
54219
55221
56235

[8,15,18,21,33,35,39,45,51,55,57,63,65,69,77,81,
 85,87,91,93,95,99,111,115,117,119,123,128,129,133,
 141,143,145,147,153,155,159,161,162,171,175,177,
 183,185,187,201,203,205,207,209,213,215,217,219,
 221,235]