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A081486 as a simple table

na(n)
11
23
33
47
519
619
713
823
931
1031
1131
1247
1347
1443
1561
1673
1779
1883
19167
2073
21103
22103
23109
24193
25269
26137
27127
28109
29127
30137
31131
32137
33193
34223
35181
36173
37239
38191
39223
40367
41283
42263
43431
44367
45229
46251
47389
48251
49461
50263
51313
52631
53373
54263
55439
56271
57373

[1,3,3,7,19,19,13,23,31,31,31,47,47,43,61,73,79,
 83,167,73,103,103,109,193,269,137,127,109,127,137,
 131,137,193,223,181,173,239,191,223,367,283,263,
 431,367,229,251,389,251,461,263,313,631,373,263,
 439,271,373]