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A088640 as a simple table

na(n)
02
11
23
31
49
57
629
71
83
97
1039
111
1223
131
1497
151
1691
1737
1859
199
2093
2119
2297
2361
24293
2561
263
271
2857
297
3043
3161
327
3353
3431
35127
36353
3767
38841
39187
409
413
42179
43429
44127
4597
463
47319
4811
4951
5039
51191
5233
533
5441
557
5639
5747
5873
5981
60401
6157
62441
63571
64957
65997
661
6719
68291
69173
709
71417

[2,1,3,1,9,7,29,1,3,7,39,1,23,1,97,1,91,37,59,9,
 93,19,97,61,293,61,3,1,57,7,43,61,7,53,31,127,353,
 67,841,187,9,3,179,429,127,97,3,319,11,51,39,191,
 33,3,41,7,39,47,73,81,401,57,441,571,957,997,1,19,
 291,173,9,417]