login
a(1)=5; a(n) is concatenation of squares of digits in a(n-1) (in base 10).
2

%I #4 Mar 30 2012 17:27:18

%S 5,25,425,16425,13616425,193613616425,181936193613616425,

%T 164181936181936193613616425,

%U 13616164181936164181936181936193613616425,19361361361616418193613616164181936164181936181936193613616425

%N a(1)=5; a(n) is concatenation of squares of digits in a(n-1) (in base 10).

%C If m is a member of the sequence represented by k digits in base 10, all members greater than m are congruent to m mod 10^k.

%e The squares of the digits in the third term, 425, are 16, 4 and 25; hence a(4)=16425.

%Y Cf. A061588.

%K base,easy,nonn

%O 1,1

%A _Matthew Vandermast_, Apr 01 2003