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A053672 as a simple table

na(n)
15
27
37
411
511
65
711
87
97
107
115
1211
1311
1411
157
165
177
1811
1913
2013
215
227
237
247
2511
265
2711
2811
297
307
315
3213
3313
3411
3511
365
377
387
3911
4011
415
4213
437
447
457
465
4711
4811
4911
507
515
527
5313
5413
5513
565
577
587
597
6011
615
6211
6317
647
657
665
6711
6811
6911
7011
715
727
737
7413
7517
765
7717
787
797
807
815
8211
8311
8411
857

[5,7,7,11,11,5,11,7,7,7,5,11,11,11,7,5,7,11,13,13,
 5,7,7,7,11,5,11,11,7,7,5,13,13,11,11,5,7,7,11,11,
 5,13,7,7,7,5,11,11,11,7,5,7,13,13,13,5,7,7,7,11,5,
 11,17,7,7,5,11,11,11,11,5,7,7,13,17,5,17,7,7,7,5,
 11,11,11,7]