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A087749 as a simple table

na(n)
13
27
317
419
529
631
737
841
943
1047
1153
1259
1367
1471
1573
1679
1789
1897
19101
20103
21107
22109
23113
24127
25131
26137
27139
28149
29151
30157
31163
32167
33173
34179
35181
36191
37193
38197
39199
40211
41223
42227
43229
44233
45239
46241
47251
48257
49263
50269
51271
52277
53281

[3,7,17,19,29,31,37,41,43,47,53,59,67,71,73,79,89,
 97,101,103,107,109,113,127,131,137,139,149,151,
 157,163,167,173,179,181,191,193,197,199,211,223,
 227,229,233,239,241,251,257,263,269,271,277,281]