a(1) = 1; a(n) = smallest number such that the concatenation a(1)a(2)...a(n) is a square.

A061110

a(1) = 1; a(n) = smallest number such that the concatenation a(1)a(2)...a(n) is a square.

Terms

    a(0) =1a(1) =6a(2) =9a(3) =744a(4) =41796a(5) =60172924176

External references