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A274443 as a simple table

na(n)
1561
221
385
415
521
635
733
821
965
1091
1157
1291
13133
1455
15161
1691
1757
18133
1933
20253
2165
2291
23145
24115
25217
26451
27161
28703
29253
30551
31561
32253
33481
34217
35129
36451
37301
381081
39161
401189
41145
42989
43217
44235
45481
46703
47649
48329
49265
501081
511121
521219
53145
541037
55721

[561,21,85,15,21,35,33,21,65,91,57,91,133,55,161,
 91,57,133,33,253,65,91,145,115,217,451,161,703,
 253,551,561,253,481,217,129,451,301,1081,161,1189,
 145,989,217,235,481,703,649,329,265,1081,1121,
 1219,145,1037,721]