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A185104 as a simple table

na(n)
111
213
317
431
537
671
773
879
997
10113
11131
12179
13199
14311
15337
16373
17733
18919
19991
203911

[11,13,17,31,37,71,73,79,97,113,131,179,199,311,
 337,373,733,919,991,3911]