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%I #6 Jul 21 2021 22:47:52
%S 7,55,5255,6295,75511,92137,5551405,7943911,1257669432489239675,
%T 2148743977942130765,2877834685014859837,4164942361780146967,
%U 10235898967817894552965,15389481849681116007757
%N Numbers k such that k concatenated with k-5 gives the product of two numbers which differ by 1.
%Y Cf. A116115, A116121, A116134, A116251.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006