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A140718 as a simple table

na(n)
131
231
331
431
51597
61597
71597
81597
937
1037
1137
1237
131487
141487
151487
161487
1747
1847
1947
2047
211381
221381
231381
241381
2561
2661
2761
2861
291279
301279
311279
321279
3379
3479
3579
3679
371181
381181
391181
401181
41101
42101
43101
44101
451087
461087
471087
481087
49127
50127
51127

[31,31,31,31,1597,1597,1597,1597,37,37,37,37,1487,
 1487,1487,1487,47,47,47,47,1381,1381,1381,1381,61,
 61,61,61,1279,1279,1279,1279,79,79,79,79,1181,
 1181,1181,1181,101,101,101,101,1087,1087,1087,
 1087,127,127,127]