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A023237 as a simple table

na(n)
13
27
313
419
531
643
797
8103
9109
10151
11157
12181
13193
14211
15241
16271
17337
18349
19367
20409
21421
22439
23487
24523
25547
26571
27601
28613
29631
30691
31733
32769
33811
34823
35829
36883
37937
381009
391021
401033
411039
421063
431069
441117
451201
461249
471279
481291
491459
501483
511489

[3,7,13,19,31,43,97,103,109,151,157,181,193,211,
 241,271,337,349,367,409,421,439,487,523,547,571,
 601,613,631,691,733,769,811,823,829,883,937,1009,
 1021,1033,1039,1063,1069,1117,1201,1249,1279,1291,
 1459,1483,1489]