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A121615 as a simple table

na(n)
12
23
35
47
511
613
715
817
919
1023
1129
1231
1335
1437
1541
1643
1747
1849
1953
2059
2161
2267
2371
2473
2579
2683
2789
2897
29101
30103
31107
32109
33113
34121
35127
36131
37137
38139
39143
40149
41151
42157
43163
44167
45169
46173
47179
48181
49187
50191
51193
52197
53199
54211
55221
56223
57227
58229
59233
60239

[2,3,5,7,11,13,15,17,19,23,29,31,35,37,41,43,47,
 49,53,59,61,67,71,73,79,83,89,97,101,103,107,109,
 113,121,127,131,137,139,143,149,151,157,163,167,
 169,173,179,181,187,191,193,197,199,211,221,223,
 227,229,233,239]