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A156680 as a simple table

na(n)
11
27
317
47
531
649
723
871
997
1047
11127
12161
131
1479
15199
16241
17119
18287
19337
2017
21167
22391
23449
24223
2523
26511
27577
2841
29287
30647
3141
32721
33359
34799
35881
3673
37439
38967
391057
407
41527
421151
4389
441249
45113
46623
471351
481457
49727
50119
511567
521681
5331
54161
55839
561799
571921

[1,7,17,7,31,49,23,71,97,47,127,161,1,79,199,241,
 119,287,337,17,167,391,449,223,23,511,577,41,287,
 647,41,721,359,799,881,73,439,967,1057,7,527,1151,
 89,1249,113,623,1351,1457,727,119,1567,1681,31,
 161,839,1799,1921]