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A253408 as a simple table

na(n)
1-1
21
37
417
523
631
741
847
949
1071
1173
1279
1389
1497
15103
16113
17119
18127
19137
20151
21161
22167
23191
24193
25199
26217
27223
28233
29239
30241
31257
32263
33271
34281
35287
36289
37311
38313
39329
40337
41343
42353
43359
44367
45383
46391
47401
48409
49431
50433
51439
52449
53457
54463
55479
56487

[-1,1,7,17,23,31,41,47,49,71,73,79,89,97,103,113,
 119,127,137,151,161,167,191,193,199,217,223,233,
 239,241,257,263,271,281,287,289,311,313,329,337,
 343,353,359,367,383,391,401,409,431,433,439,449,
 457,463,479,487]