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A036491 as a simple table

na(n)
15
27
311
425
535
649
755
877
9121
10125
11175
12245
13275
1449
15385
16539
17605
18625
19847
20875
211225
221331
231375
24245
251925
26343
272695
283025
293125
30539
314235
324375
335929
346125
356655
366875
371225
389317
399625
401715
4113475
4214641
4315125
4415625
45343
462695
4721175

[5,7,11,25,35,49,55,77,121,125,175,245,275,49,385,
 539,605,625,847,875,1225,1331,1375,245,1925,343,
 2695,3025,3125,539,4235,4375,5929,6125,6655,6875,
 1225,9317,9625,1715,13475,14641,15125,15625,343,
 2695,21175]