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A175329 as a simple table

na(n)
13
27
37
415
515
629
719
823
931
1031
1163
1245
1343
1447
1563
1663
1763
18127
1971
2079
2179
2295
2391
24121
25101
26103
27111
28111
29125
30127
31255
32139
33139
34159
35151
36159
37191
38167
39175
40191
41183
42191
43255
44197
45199
46215
47223
48255
49231
50237
51239
52255
53251
54507
55263
56271
57271
58287

[3,7,7,15,15,29,19,23,31,31,63,45,43,47,63,63,63,
 127,71,79,79,95,91,121,101,103,111,111,125,127,
 255,139,139,159,151,159,191,167,175,191,183,191,
 255,197,199,215,223,255,231,237,239,255,251,507,
 263,271,271,287]