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A028870 as a simple table

na(n)
12
23
35
47
59
613
715
819
921
1027
1129
1233
1335
1437
1543
1647
1749
1855
1961
2063
2169
2271
2375
2477
2589
2693
27103
28107
29117
30119
31121
32127
33131
34135
35139
36145
37155
38161
39169
40173
41177
42183
43191
44205
45211
46217
47223
48231
49233
50237
51239
52247
53253
54257
55259
56265
57267
58273
59279
60285

[2,3,5,7,9,13,15,19,21,27,29,33,35,37,43,47,49,55,
 61,63,69,71,75,77,89,93,103,107,117,119,121,127,
 131,135,139,145,155,161,169,173,177,183,191,205,
 211,217,223,231,233,237,239,247,253,257,259,265,
 267,273,279,285]