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A177941 as a simple table

na(n)
15
27
39
415
527
631
733
837
939
1075
1181
12159
13165
14327
15331
16333
17337
18339
19349
20351
21699
22715
23717
24721
25723
26727
27729
28745
29747
30751
31753
32757
33759
341515
351531
361533
371537
381539
391561
401563
411567
421569
433135
443147
453151
463153
473157
483159
493165
506327
516331
526333
536337

[5,7,9,15,27,31,33,37,39,75,81,159,165,327,331,
 333,337,339,349,351,699,715,717,721,723,727,729,
 745,747,751,753,757,759,1515,1531,1533,1537,1539,
 1561,1563,1567,1569,3135,3147,3151,3153,3157,3159,
 3165,6327,6331,6333,6337]