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A137626 as a simple table

na(n)
12
231
3181
4733
51777
68363
78369
819273
9175333
10175349
1133952819
124377722977
134377723013
141242030992717
151242030992723

[2,31,181,733,1777,8363,8369,19273,175333,175349,
 33952819,4377722977,4377723013,1242030992717,
 1242030992723]