A048412 - OEIS

%I #15 Sep 26 2021 09:15:26

%S 0,1,2,3,11,26,111,1111,11111,111111,1111111,11111111,111111111

%N a(n)^2 is a square whose consecutive digits differ by 1.

%C a(14), if it exists, is > 10^17. - _Lars Blomberg_, Nov 25 2016

%F a(n) = sqrt(A048411(n)).

%Y Cf. A002477, A048411.

%K nonn,base,more

%O 1,3

%A _Patrick De Geest_, Apr 15 1999

%E Offset changed to 1 by _Jinyuan Wang_, Sep 04 2021