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A175377 as a simple table

na(n)
01
17
227
327
433
581
6117
7125
8125
9131
10251
11275
12275
13311
14335
15335
16349
17493
18493
19613
20613
21637
22637
23697
24697
25727
26871
27991
28999
291023
301143
311143
321191
331191
341215
351215
361281
371449
381569
391617
401737
411785
421785
431809
441889
451985
461985
472033
482033

[1,7,27,27,33,81,117,125,125,131,251,275,275,311,
 335,335,349,493,493,613,613,637,637,697,697,727,
 871,991,999,1023,1143,1143,1191,1191,1215,1215,
 1281,1449,1569,1617,1737,1785,1785,1809,1889,1985,
 1985,2033,2033]