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A067528 as a simple table

na(n)
15
26
37
49
511
615
717
821
923
1027
1133
1235
1345
1447
1557
1663
1775
1877
1983
2087
21105
22117
23143
24153
25167
26195
27215
28227
29243
30245
31255
32287
33297
34413
35437
36447
37483
38495
39507
40525
41573
42635
43657
44677
45755
46825
471113
481133
491295
501487
511515
521547
531617
541623
552015

[5,6,7,9,11,15,17,21,23,27,33,35,45,47,57,63,75,
 77,83,87,105,117,143,153,167,195,215,227,243,245,
 255,287,297,413,437,447,483,495,507,525,573,635,
 657,677,755,825,1113,1133,1295,1487,1515,1547,
 1617,1623,2015]