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A176945 as a simple table

na(n)
121
233
355
477
587
691
7111
8115
9119
10129
11155
12161
13185
14215
15235
16247
17249
18259
19267
20287
21291
22295
23301
24303
25305
26323
27339
28341
29355
30361
31365
32381
33417
34427
35453
36469
37481
38485
39501
40505
41511
42517
43527
44533
45537
46551
47573
48589
49591

[21,33,55,77,87,91,111,115,119,129,155,161,185,
 215,235,247,249,259,267,287,291,295,301,303,305,
 323,339,341,355,361,365,381,417,427,453,469,481,
 485,501,505,511,517,527,533,537,551,573,589,591]