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%I #8 Jul 19 2021 22:37:18
%S 12,43,20440836,30017751,61336887,52400871197755334426147587,
%T 53651708763838760619655612,56652002793835820319625612,
%U 57952296063256269823192087,17684775866714240650923831481623
%N Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 6.
%C Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 4. For proof that this is the same sequence compare A116133.
%e 61336887//61336891 = 78317867 * 78317873, where // denotes concatenation. 61336887//61336896 = 78317868 * 78317872.
%Y Cf. A116173, A115429, A116133, A116194, A116318.
%Y Cf. A116193, A116180, A116350.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
%E Edited by _N. J. A. Sloane_, Apr 11 2007
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