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A115913 as a simple table

na(n)
15
27
39
412
552
660
764
874
978
1096
11118
12122
13124
14132
15138
16150
17160
18166
19184
20186
21190
22210
23234
24240
25250
26252
27256
28258
29284
30306
31314
32334
33438
34462
35500
36570
37612
38666
39678
40690
41874
421056
431396
441650
451784
461860
471946
481994
492020
502052
512188

[5,7,9,12,52,60,64,74,78,96,118,122,124,132,138,
 150,160,166,184,186,190,210,234,240,250,252,256,
 258,284,306,314,334,438,462,500,570,612,666,678,
 690,874,1056,1396,1650,1784,1860,1946,1994,2020,
 2052,2188]