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A021007 as a simple table

na(n)
15
213
331
461
5103
6139
7181
8193
9229
10421
11523
12571
13601
14811
15823
161021
171231
181279
191291
201609
211669
221873
232083
242551
252659
262689
272971
283121
293253
303331
313361
323769
333823
343919
354003
365233
375419
385479
396091
406271
416553
426661
436691
448221
458821
468971

[5,13,31,61,103,139,181,193,229,421,523,571,601,
 811,823,1021,1231,1279,1291,1609,1669,1873,2083,
 2551,2659,2689,2971,3121,3253,3331,3361,3769,3823,
 3919,4003,5233,5419,5479,6091,6271,6553,6661,6691,
 8221,8821,8971]