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A103246 as a simple table

na(n)
121
227
333
455
557
663
775
877
981
1087
1191
1293
1399
14105
15111
16115
17117
18119
19123
20125
21129
22133
23135
24143
25147
26153
27155
28161
29165
30171
31177
32183
33185
34187
35189
36195
37201
38203
39207
40213
41215
42217
43219
44225
45235
46237
47243
48247
49249
50253
51255
52259
53265
54267
55273

[21,27,33,55,57,63,75,77,81,87,91,93,99,105,111,
 115,117,119,123,125,129,133,135,143,147,153,155,
 161,165,171,177,183,185,187,189,195,201,203,207,
 213,215,217,219,225,235,237,243,247,249,253,255,
 259,265,267,273]