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A253646 as a simple table

na(n)
12
23
35
417
548989
65453971
761636943111479
8128359315177123
9884785266899689
101116777231836989

[2,3,5,17,48989,5453971,61636943111479,
 128359315177123,884785266899689,1116777231836989]