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A207337 as a simple table

na(n)
15
217
329
453
573
6109
7137
8281
9397
10449
11593
12757
13941
141061
151277
161613
171877
182161
192341
202657
212789
223881
234973
245153
256101
266917
277129
287673
298009
308237
318821
329181
3310433
3412041
3513177
3613469
3713913
3814669
3915761
4017389
4118233
4218749

[5,17,29,53,73,109,137,281,397,449,593,757,941,
 1061,1277,1613,1877,2161,2341,2657,2789,3881,4973,
 5153,6101,6917,7129,7673,8009,8237,8821,9181,
 10433,12041,13177,13469,13913,14669,15761,17389,
 18233,18749]