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%I #6 Jul 15 2021 06:30:21
%S 15,771,939,2099721,2935179,5235841,5424812334857206131,
%T 6846608332924813315,1458115445754267551129074204621,
%U 3821059872421656136462055529015,5557540612916539470512122318065
%N Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 1.
%e 5235841//5235832 = 7235911 * 7235912, where // denotes
%e concatenation.
%Y Cf. A116095, A116101, A116225.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006