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Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-3.
5

%I #13 Jul 18 2021 06:48:08

%S 81,77394227,89158933,36623663376237623663376335,

%T 37633762366336633762366235,62366237633663366237633761,

%U 63376336623762376336623661,86194223018927804587702128

%N Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-3.

%e 89158933 * 89158938 = 79493157//79493154, where // denotes concatenation.

%Y Cf. A028557, A116099, A116261, A116267, A116269, A116276.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006