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A281246 as a simple table

na(n)
131
243
357
467
523
621
7129
861
983
10163
1199
1283
1319
14155
1587
16291
17279
18185
1999
20199
21381
22125
23239
24365
25195
26129
2793
28291
29399
3085
31269
32221
3351
3489
3521
36591
37521
3819
39427
4079
41235
4247
43223
44407
45627
4631
4711
48377
49289
50513
51259
52731
53219
54329
55543
56743
57101

[31,43,57,67,23,21,129,61,83,163,99,83,19,155,87,
 291,279,185,99,199,381,125,239,365,195,129,93,291,
 399,85,269,221,51,89,21,591,521,19,427,79,235,47,
 223,407,627,31,11,377,289,513,259,731,219,329,543,
 743,101]