a(n) is the square of the number consisting of one 1 and n 3's: (133...3)^2.

A309907

a(n) is the square of the number consisting of one 1 and n 3's: (133...3)^2.

Terms

    a(0) =1a(1) =169a(2) =17689a(3) =1776889a(4) =177768889a(5) =17777688889

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