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A161218 as a simple table

na(n)
13
27
313
431
543
6211
7241
8317
9443
10499
11709
121097
131223
141459
151549
161663
171789

[3,7,13,31,43,211,241,317,443,499,709,1097,1223,
 1459,1549,1663,1789]