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A266966 as a simple table

na(n)
12
25
313
437
541
653
773
8109
9137
10157
11173
12181
13193
14197
15233
16349
17373
18401
19421
20457
21509
22541
23557
24569
25577
26613
27661
28709
29733
30757
31769
32821
33877
34941
351009
361033
371069
381117
391129
401193
411201
421237
431301
441373
451453
461493
471549
481597
491621
501657
511669
521697
531721

[2,5,13,37,41,53,73,109,137,157,173,181,193,197,
 233,349,373,401,421,457,509,541,557,569,577,613,
 661,709,733,757,769,821,877,941,1009,1033,1069,
 1117,1129,1193,1201,1237,1301,1373,1453,1493,1549,
 1597,1621,1657,1669,1697,1721]