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A261871 as a simple table

na(n)
13
27
39
415
521
627
731
833
935
1039
1145
1249
1351
1457
1563
1669
1775
1877
1981
2087
2191
2293
2399
24105
25111
26117
27119
28123
29127
30129
31133
32135
33141
34147
35153
36155
37159
38161
39165
40171
41175
42177
43183
44189
45195
46201
47203
48207
49213
50217
51219
52225
53231
54237
55243
56245
57249
58255
59259
60261
61267
62273
63279
64285
65287
66291
67297
68301

[3,7,9,15,21,27,31,33,35,39,45,49,51,57,63,69,75,
 77,81,87,91,93,99,105,111,117,119,123,127,129,133,
 135,141,147,153,155,159,161,165,171,175,177,183,
 189,195,201,203,207,213,217,219,225,231,237,243,
 245,249,255,259,261,267,273,279,285,287,291,297,
 301]