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A057660 as a simple table

na(n)
11
23
37
411
521
621
743
843
961
1063
11111
1277
13157
14129
15147
16171
17273
18183
19343
20231
21301
22333
23507
24301
25521
26471
27547
28473
29813
30441
31931
32683
33777
34819
35903
36671
371333
381029
391099
40903
411641
42903
431807
441221
451281
461521
472163
481197
492101
501563
511911
521727

[1,3,7,11,21,21,43,43,61,63,111,77,157,129,147,
 171,273,183,343,231,301,333,507,301,521,471,547,
 473,813,441,931,683,777,819,903,671,1333,1029,
 1099,903,1641,903,1807,1221,1281,1521,2163,1197,
 2101,1563,1911,1727]