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A246497 as a simple table

na(n)
13
27
323
447
5283
6719
71439
82879
934549
10138197
111266767
1214619833
1336449279
14377982107
151432349099

[3,7,23,47,283,719,1439,2879,34549,138197,1266767,
 14619833,36449279,377982107,1432349099]