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A007921 as a simple table

na(n)
17
213
319
423
525
631
733
837
943
1047
1149
1253
1355
1461
1563
1667
1773
1875
1979
2083
2185
2289
2391
2493
2597
26103
27109
28113
29115
30117
31119
32121
33123
34127
35131
36133
37139
38141
39143
40145
41151
42153
43157
44159
45163
46167
47169
48173
49175
50181
51183
52185
53187
54193

[7,13,19,23,25,31,33,37,43,47,49,53,55,61,63,67,
 73,75,79,83,85,89,91,93,97,103,109,113,115,117,
 119,121,123,127,131,133,139,141,143,145,151,153,
 157,159,163,167,169,173,175,181,183,185,187,193]