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A033933 as a simple table

na(n)
20
31
41
57
61
71
831
913
1011
1113
121
1323
141
1547
1653
1759
1841
19101
2031
2131
2273
2389
2473
25149
2637
2743
28101
2931
301
3161
321
331
34193
35113
36127
3797
381
3973
4083
41131
4279
43109
44109
4553
4689
4779
48103
4959
5097
51179
5267
5359
54127
5561
56461
57277
58109
59137
60139
6171
6271
63101
64359
65127
66317
67191
68251
69103
7097
71751
72163
73373
74199
75167
76157
77491
78317

[0,1,1,7,1,1,31,13,11,13,1,23,1,47,53,59,41,101,
 31,31,73,89,73,149,37,43,101,31,1,61,1,1,193,113,
 127,97,1,73,83,131,79,109,109,53,89,79,103,59,97,
 179,67,59,127,61,461,277,109,137,139,71,71,101,
 359,127,317,191,251,103,97,751,163,373,199,167,
 157,491,317]