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%I A116169 #8 Jul 20 2021 23:46:40
%S A116169 9,49,1166975893986638437392162264780939,
%T A116169 1411174268292962563778302427727571,1860631503683565562655236868895135
%N A116169 Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 9.
%C A116169 Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 7.
%e A116169 49//50 = 66 * 75, where // denotes concatenation.
%e A116169 49//58 = 67 * 74.
%Y A116169 Cf. A116162, A116168, A116175, A116300.
%Y A116169 Cf. A116215, A116174, A116223, A116353.
%K A116169 nonn,base
%O A116169 1,1
%A A116169 _Giovanni Resta_, Feb 06 2006
%E A116169 Edited by _N. J. A. Sloane_, Apr 15 2007

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