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A198439 as a simple table

na(n)
11
27
37
417
51
623
731
849
917
1047
1123
1271
137
1441
1541
1679
1797
187
1931
2073
21127
22119
2389
2417
25161
2647
27113
28167
29119
301
31199
3249
3373
34103
35161
36223
37241
3823
3931
40103
4189
42191
43287
44151
45217
46287
47137
48233
4971
50337
5179
52137
5317
54281
55359
56391
5749
58113
59119
60217

[1,7,7,17,1,23,31,49,17,47,23,71,7,41,41,79,97,7,
 31,73,127,119,89,17,161,47,113,167,119,1,199,49,
 73,103,161,223,241,23,31,103,89,191,287,151,217,
 287,137,233,71,337,79,137,17,281,359,391,49,113,
 119,217]