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%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
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