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A259175 as a simple table

na(n)
12
21
31
47
51
613
71
819
923
1029
111
1237
131
1443
1547
1653
171
1861
191
2071
2173
2279
231
2489
2597
26101
27103
28107
291
30113
311
32131
33137
34139
35149
36151
371
38163
39167
40173
411
42181
431
44193
45197
46199
471
48223
49227
50229
51233
52239
531
54251
55257
56263
57269
58271
591
60281
611
62293
63307
64311

[2,1,1,7,1,13,1,19,23,29,1,37,1,43,47,53,1,61,1,
 71,73,79,1,89,97,101,103,107,1,113,1,131,137,139,
 149,151,1,163,167,173,1,181,1,193,197,199,1,223,
 227,229,233,239,1,251,257,263,269,271,1,281,1,293,
 307,311]