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A276730 as a simple table

na(n)
12
23
37
47
511
67
715
819
923
1039
1131
1239
1331
1443
1547
1639
1759
1871
1967
2071
2179
2279
2383
2479
2579
26103
27103
28107
29103
30127
31127
32131
33159
34139
35135
36151
37135
38163
39167
40199
41179
42199
43191
44207
45199
46199
47211
48223
49227
50199
51207
52239
53271
54251
55255
56263
57295
58271
59295
60271

[2,3,7,7,11,7,15,19,23,39,31,39,31,43,47,39,59,71,
 67,71,79,79,83,79,79,103,103,107,103,127,127,131,
 159,139,135,151,135,163,167,199,179,199,191,207,
 199,199,211,223,227,199,207,239,271,251,255,263,
 295,271,295,271]