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A176257 as a simple table

na(n)
115
239
351
475
587
691
7111
8119
9123
10135
11143
12159
13183
14187
15195
16203
17219
18255
19259
20267
21287
22291
23303
24319
25327
26339
27351
28371
29375
30407
31411
32427
33435
34447
35451
36455
37459
38471
39507
40511
41519
42543
43551
44555
45579
46583
47591
48595
49615
50623
51663
52667
53671

[15,39,51,75,87,91,111,119,123,135,143,159,183,
 187,195,203,219,255,259,267,287,291,303,319,327,
 339,351,371,375,407,411,427,435,447,451,455,459,
 471,507,511,519,543,551,555,579,583,591,595,615,
 623,663,667,671]