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A075278 as a simple table

na(n)
16
29
315
421
539
669
793
8111
9129
10309
11381
12393
13453
14489
15501
16687
17723
18771
19879
20933
21939
221011
231167
241299
251527
261563
271569
281839
291941
301983
312157
322217
332229
342271
352391
362463
372661
382811
392859
402913
413039
423099
433189
443453
453459
463651
473849

[6,9,15,21,39,69,93,111,129,309,381,393,453,489,
 501,687,723,771,879,933,939,1011,1167,1299,1527,
 1563,1569,1839,1941,1983,2157,2217,2229,2271,2391,
 2463,2661,2811,2859,2913,3039,3099,3189,3453,3459,
 3651,3849]