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A320431 as a simple table

na(n)
31
41
531
613
771
825
9127
1041
11199
1261
13287
1485
15391
16113
17511
18145
19647
20181
21799
22221
23967
24265
251151
26313
271351
28365
291567
30421
311799
32481
332047
34545
352311
36613
372591
38685
392887
40761
413199
42841
433527
44925
453871
461013
474231
481105
494607
501201
514999
521301
535407
541405
555831
561513
576271
581625
596727
601741

[1,1,31,13,71,25,127,41,199,61,287,85,391,113,511,
 145,647,181,799,221,967,265,1151,313,1351,365,
 1567,421,1799,481,2047,545,2311,613,2591,685,2887,
 761,3199,841,3527,925,3871,1013,4231,1105,4607,
 1201,4999,1301,5407,1405,5831,1513,6271,1625,6727,
 1741]