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A273960 as a simple table

na(n)
1-2
23
3-5
47
5-11
613
7-17
819
9-23
1029
11-31
1237
13-41
1443
15-47
1653
17-59
1861
19-67
2071
21-73
2279
23-83
2489
25-97
26101
27-103
28107
29-109
30113
31-127
32131
33-137
34139
35-149
36151
37-157
38163
39-167
40173
41-179
42181
43-191
44193
45-197
46199
47-211
48223
49-227
50229
51-233
52239
53-241
54251
55-257
56263
57-269
58271

[-2,3,-5,7,-11,13,-17,19,-23,29,-31,37,-41,43,-47,
 53,-59,61,-67,71,-73,79,-83,89,-97,101,-103,107,
 -109,113,-127,131,-137,139,-149,151,-157,163,-167,
 173,-179,181,-191,193,-197,199,-211,223,-227,229,
 -233,239,-241,251,-257,263,-269,271]