A116224 - OEIS

%I #10 Jul 18 2021 06:48:50

%S 23,27,10357253,10577583,45531191,45991881,12823841629508531559818193,

%T 17153953024599261169512903,34319291138166088695725681,

%U 41203057971387248588060861,75861857890090990570762781

%N Numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 9.

%e 45991881//45991890 = 67817310 * 67817319, where // denotes concatenation.

%Y Cf. A116216, A116223, A116355.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006