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Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+6.
4

%I #7 Jul 17 2021 01:44:38

%S 387,431,569,613,816,4523,5477,90912,316834,683166,3636366,6363634,

%T 82352944,331668334,368421055,395604393,442767756,461538464,488721802,

%U 511278198,538461536,557232244,604395607,631578945,668331666

%N Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+6.

%Y Cf. A116185, A116322, A116330, A116343.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006