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A319664 as a simple table

na(n)
21
31
45
51
613
79
85
91
1029
119
125
1317
1413
1525
1621
171
1861
199
2037
2117
2213
2325
2453
2533
2629
2741
285
2949
3045
3157
3221
331
34125
359
36101
3781
3813
3989
40117
4133
4229
4341
445
45113
4645
47121
4821
4965
5061
5173
5237
5317
5477
5525
5653
5797
5893
59105
6069
6149
62109
6357
6485

[1,1,5,1,13,9,5,1,29,9,5,17,13,25,21,1,61,9,37,17,
 13,25,53,33,29,41,5,49,45,57,21,1,125,9,101,81,13,
 89,117,33,29,41,5,113,45,121,21,65,61,73,37,17,77,
 25,53,97,93,105,69,49,109,57,85]