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A107803 as a simple table

na(n)
15
253
33
413
511
617
77
837
923
102
1129
1219
1331
1441
1543
1647
1767
1861
1971
2073
2179
2259
2389
2483
25103
26101
27107
2897
29109
30113
31127
32131
33137
34139
35149
36151
37157
38163
39167
40173
41179
42181
43191
44193
45197
46199
47211
48223
49227
50229
51233
52239
53241
54251
55257
56263
57269
58271
59277

[5,53,3,13,11,17,7,37,23,2,29,19,31,41,43,47,67,
 61,71,73,79,59,89,83,103,101,107,97,109,113,127,
 131,137,139,149,151,157,163,167,173,179,181,191,
 193,197,199,211,223,227,229,233,239,241,251,257,
 263,269,271,277]