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A068008 as a simple table

na(n)
02
13
23
31
49
57
629
739
83
943
1039
111
1223
1327
1497
1553
1691
1737
18251
1993
2093
2119
2297
2361
24293
25153
26163
271
28297
29103
30323
3161
32127
33113
3431
35127
36353
3767
38841
39187
409
4121
42179
43429
44127
4597
463
47319
4811
4951
5039
51191
5233
533
5441
55151
5639
5747
58169
59787
60401
6157
62441
63571

[2,3,3,1,9,7,29,39,3,43,39,1,23,27,97,53,91,37,
 251,93,93,19,97,61,293,153,163,1,297,103,323,61,
 127,113,31,127,353,67,841,187,9,21,179,429,127,97,
 3,319,11,51,39,191,33,3,41,151,39,47,169,787,401,
 57,441,571]