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A273687 as a simple table

na(n)
01
15
29
317
417
537
653
749
873
997
1089
11109
12129
13181
14241
15261
16297
17245
18309
19325
20401
21425
22477
23557
24565
25581
26613
27681
28789
29857
30761
311081
32981
331049
341193
351097
361229
371213
381305
391545
401513
411569
421677
431737
441837
451857
461913
472121
482065
492233
502353

[1,5,9,17,17,37,53,49,73,97,89,109,129,181,241,
 261,297,245,309,325,401,425,477,557,565,581,613,
 681,789,857,761,1081,981,1049,1193,1097,1229,1213,
 1305,1545,1513,1569,1677,1737,1837,1857,1913,2121,
 2065,2233,2353]