a(1) = 15, a(n) = smallest number > a(n-1) such that the concatenation of a(n-1) and a(n) is a square.

A265153

a(1) = 15, a(n) = smallest number > a(n-1) such that the concatenation of a(n-1) and a(n) is a square.

Terms

    a(0) =15a(1) =21a(2) =316a(3) =969a(4) =6996a(5) =55401a(6) =390625a(7) =1827776a(8) =2562500a(9) =8273225a(10) =37136225a(11) =38371001a(12) =43037561a(13) =258421444a(14) =792669636a(15) =2928667041a(16) =38512058944a(17) =260125180889a(18) =405701529401a(19) =688085041025

External references