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A273326 as a simple table

na(n)
01
15
25
317
49
529
617
761
817
977
1033
11125
1245
13161
1469
15257
1661
17281
1885
19353
2097
21389
22121
23485
24121
25533
26169
27677
28205
29785
30277
311073
32245
331121
34293
351265
36305
371301
38329
391397
40329
411445
42377
431589
44413
451697
46485
471985
48461
492057
50533
512273
52569

[1,5,5,17,9,29,17,61,17,77,33,125,45,161,69,257,
 61,281,85,353,97,389,121,485,121,533,169,677,205,
 785,277,1073,245,1121,293,1265,305,1301,329,1397,
 329,1445,377,1589,413,1697,485,1985,461,2057,533,
 2273,569]