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A257246 as a simple table

na(n)
12
23
33
43
53
65
73
83
93
105
117
127
133
143
157
163
175
183
195
205
2111
223
2313
243
2513
265
2711
283
297
303
3113
323
3313
343
355
365
3711
3823
393
407
413
427
433
447
453
4631
473
487
4913
503
517
525
537
543
5531
5631
573
5813
5941
605
613
627
6319
643
657
6641
6741
683
6919
707
7129
725
733
7413
7511
765
773
7819
793
805
815

[2,3,3,3,3,5,3,3,3,5,7,7,3,3,7,3,5,3,5,5,11,3,13,
 3,13,5,11,3,7,3,13,3,13,3,5,5,11,23,3,7,3,7,3,7,3,
 31,3,7,13,3,7,5,7,3,31,31,3,13,41,5,3,7,19,3,7,41,
 41,3,19,7,29,5,3,13,11,5,3,19,3,5,5]