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A175510 as a simple table

na(n)
1-1
21
33
47
515
625
733
843
945
1055
1163
1261
1369
1455
1581
1637
1763
1867
1993
2073
21141
22133
23159
24163
25207
26217
27231
28247
29261
30355
31363
32349
33375
34343
35477
36469
37483
38439
39465
40457
41531
42439
43447
44439
45453
46505
47525
48439
49441
50469
51477
52469

[-1,1,3,7,15,25,33,43,45,55,63,61,69,55,81,37,63,
 67,93,73,141,133,159,163,207,217,231,247,261,355,
 363,349,375,343,477,469,483,439,465,457,531,439,
 447,439,453,505,525,439,441,469,477,469]