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A147993 as a simple table

na(n)
11
25
37
429
531
641
743
8173
9175
10185
11187
12245
13247
14257
15259
161037
171039
181049
191051
201109
211111
221121
231123
241469
251471
261481
271483
281541
291543
301553
311555
326221
336223
346233
356235
366293
376295
386305
396307
406653
416655
426665
436667
446725
456727
466737
476739

[1,5,7,29,31,41,43,173,175,185,187,245,247,257,
 259,1037,1039,1049,1051,1109,1111,1121,1123,1469,
 1471,1481,1483,1541,1543,1553,1555,6221,6223,6233,
 6235,6293,6295,6305,6307,6653,6655,6665,6667,6725,
 6727,6737,6739]