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A375170 as a simple table

na(n)
15
27
311
413
519
623
729
831
937
1041
1143
1247
1353
1459
1561
1667
1771
1873
1979
2083
2189
2297
23101
24103
25107
26109
27113
28127
29131
30139
31149
32151
33157
34163
35167
36173
37179
38181
39191
40193
41197
42199
43211
44223
45229
46233
47239
48241
49251
50257
51263
52269
53271
54277
55281
56283
57293
58307

[5,7,11,13,19,23,29,31,37,41,43,47,53,59,61,67,71,
 73,79,83,89,97,101,103,107,109,113,127,131,139,
 149,151,157,163,167,173,179,181,191,193,197,199,
 211,223,229,233,239,241,251,257,263,269,271,277,
 281,283,293,307]