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A216684 as a simple table

na(n)
12
25
313
431
537
661
7127
8379
9439
10571
11619
12739
13829
14991
151549
163109
173301
183319
195749
207549
217879
2248799

[2,5,13,31,37,61,127,379,439,571,619,739,829,991,
 1549,3109,3301,3319,5749,7549,7879,48799]