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A175198 as a simple table

na(n)
11
23
37
427
515
621
731
845
973
1091
11129
1285
1363
1493
15105
16275
17257
18219
19127
20189
21217
22453
23441
24357
25601
26741
27273
28837
291191
30981
31513
32645
33903
34949
35255
36315
371649
38341
391103
401235
41455
42651
43657
441443
45775
462795
47825
481925
491911
50771

[1,3,7,27,15,21,31,45,73,91,129,85,63,93,105,275,
 257,219,127,189,217,453,441,357,601,741,273,837,
 1191,981,513,645,903,949,255,315,1649,341,1103,
 1235,455,651,657,1443,775,2795,825,1925,1911,771]