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A087521 as a simple table

na(n)
12
23
35
47
511
623
729
831
947
1059
1171
12127
13167
14179
15191
16223
17239
18359
19383
20389
21419
22431
23479
24719
25839
26863
27971
281151
291259
301279
311439
321511
332111
342309
352591
362687
372699
382879
393023
403119
413359
423583
433779
445039
455119
465399
476047
486143
496299
506719

[2,3,5,7,11,23,29,31,47,59,71,127,167,179,191,223,
 239,359,383,389,419,431,479,719,839,863,971,1151,
 1259,1279,1439,1511,2111,2309,2591,2687,2699,2879,
 3023,3119,3359,3583,3779,5039,5119,5399,6047,6143,
 6299,6719]