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A106912 as a simple table

na(n)
12
27
313
473
583
6127
7167
8173
9197
10233
11263
12283
13337
14347
15373
16503
17547
18557
19563
20607
21677
22733
23743
24787
25853
26887
27937
28953
291033
301163
311187
321297
331327
341427
351487
361553
371583
381597
391723
401777
411847
421913
431933
441987
451993
461997
472053

[2,7,13,73,83,127,167,173,197,233,263,283,337,347,
 373,503,547,557,563,607,677,733,743,787,853,887,
 937,953,1033,1163,1187,1297,1327,1427,1487,1553,
 1583,1597,1723,1777,1847,1913,1933,1987,1993,1997,
 2053]