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A283461 as a simple table

na(n)
21
31
43
51
63
71
85
97
1011
1123
127
131
1443
1531
1617
171
1819
191
2031
21127
2289
2347
2417
25601
262731
2773
28113
291103
30151
311
32257
3389
3443691
35127
3673
37223
38174763
398191
4041
4113367
42337
439719
44683
45631
46178481
474513
48257
49127
501801
5111119
522731

[1,1,3,1,3,1,5,7,11,23,7,1,43,31,17,1,19,1,31,127,
 89,47,17,601,2731,73,113,1103,151,1,257,89,43691,
 127,73,223,174763,8191,41,13367,337,9719,683,631,
 178481,4513,257,127,1801,11119,2731]