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A241859 as a simple table

na(n)
15
27
313
431
519
641
731
861
959
1071
1143
1271
13101
1461
15101
1673
17113
18103
19151
20131
21103
22109
23191
24131
25167
26211
27151
28151
29139
30241
31167
32191
33151
34227
35271
36199
37191
38181
39311
40269
41193
42167
43433
44199
45211
46269
47311
48293
49281
50229
51191
52263
53401
54241
55251

[5,7,13,31,19,41,31,61,59,71,43,71,101,61,101,73,
 113,103,151,131,103,109,191,131,167,211,151,151,
 139,241,167,191,151,227,271,199,191,181,311,269,
 193,167,433,199,211,269,311,293,281,229,191,263,
 401,241,251]