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A246755 as a simple table

na(n)
115
233
343
445
569
675
787
899
9109
10135
11141
12157
13159
14177
15207
16213
17225
18229
19249
20261
21277
22283
23297
24303
25307
26321
27363
28375
29393
30405
31423
32447
33477
34499
35501
36519
37531
38537
39573
40591
41621
42639
43643
44675
45681
46691
47717
48733
49739
50747
51783
52789
53807
54811

[15,33,43,45,69,75,87,99,109,135,141,157,159,177,
 207,213,225,229,249,261,277,283,297,303,307,321,
 363,375,393,405,423,447,477,499,501,519,531,537,
 573,591,621,639,643,675,681,691,717,733,739,747,
 783,789,807,811]