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A126992 as a simple table

na(n)
15
27
37
413
517
619
723
823
931
1037
1141
1247
1347
1453
1553
1661
1767
1873
1979
2083
2183
2289
2389
2497
25109
26113
27113
28113
29127
30127
31139
32139
33151
34151
35163
36163
37173
38173
39181
40181
41193
42199
43199
44199
45211
46211
47223
48233
49241
50241
51241
52251
53257
54263
55269

[5,7,7,13,17,19,23,23,31,37,41,47,47,53,53,61,67,
 73,79,83,83,89,89,97,109,113,113,113,127,127,139,
 139,151,151,163,163,173,173,181,181,193,199,199,
 199,211,211,223,233,241,241,241,251,257,263,269]