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A257393 as a simple table

na(n)
12
23
37
413
547
661
773
8107
9167
10179
11313
12347
13421
14479
15719
16863
171153
181213
191283
201307
211523
223467
233733
244007
254621
264787
275087
285113
295413
307523
317703
329817
3310333
3412347
3512539
3613381
3717027
3818553
3919717
4019813
4123399
4226003
4331873
4436097
4538833

[2,3,7,13,47,61,73,107,167,179,313,347,421,479,
 719,863,1153,1213,1283,1307,1523,3467,3733,4007,
 4621,4787,5087,5113,5413,7523,7703,9817,10333,
 12347,12539,13381,17027,18553,19717,19813,23399,
 26003,31873,36097,38833]