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A165615 as a simple table

na(n)
131
279
397
4127
5191
6239
7241
8337
9401
10577
11751
12769
13881
141039
151151
161231
171297
181471
191487
201567
211759
221777
231871
242207
252591
262687
272719
282767
292897
302927
313041
323391
333919
344159
354271
364481
374591
384721
394817
405231
415279
425407
435711
446257
456337

[31,79,97,127,191,239,241,337,401,577,751,769,881,
 1039,1151,1231,1297,1471,1487,1567,1759,1777,1871,
 2207,2591,2687,2719,2767,2897,2927,3041,3391,3919,
 4159,4271,4481,4591,4721,4817,5231,5279,5407,5711,
 6257,6337]