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A049572 as a simple table

na(n)
12
27
323
447
573
679
789
8103
9127
10151
11167
12199
13223
14233
15239
16257
17263
18337
19359
20367
21383
22431
23439
24463
25479
26487
27503
28599
29607
30647
31719
32727
33743
34823
35839
36863
37887
38911
39919
40937
41967
42983
431039
441063
451087
461103
471217
481223
491249
501279
511289

[2,7,23,47,73,79,89,103,127,151,167,199,223,233,
 239,257,263,337,359,367,383,431,439,463,479,487,
 503,599,607,647,719,727,743,823,839,863,887,911,
 919,937,967,983,1039,1063,1087,1103,1217,1223,
 1249,1279,1289]