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A186945 as a simple table

na(n)
12
23
35
413
517
625
731
849
961
1071
1173
1281
13103
14109
15113
16131
17139
18157
19173
20181
21191
22193
23199
24239
25241
26257
27269
28271
29283
30289
31293
32313
33353
34361
35373
36379
37409
38419
39421
40433
41439
42443
43463
44491
45499
46509
47571
48577
49599
50601
51607
52613
53619
54643
55647

[2,3,5,13,17,25,31,49,61,71,73,81,103,109,113,131,
 139,157,173,181,191,193,199,239,241,257,269,271,
 283,289,293,313,353,361,373,379,409,419,421,433,
 439,443,463,491,499,509,571,577,599,601,607,613,
 619,643,647]