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%I #8 Jul 20 2021 23:47:50
%S 7137,7767,47783068991048776635,48797525371338932241,
%T 55658688122404752991,56753136503494828605,85555875266989354735,
%U 86911515887391841491,95992713077544748491,97428345698747155255
%N Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 7.
%C Also numbers k such that k concatenated with k-5 gives the product of two numbers which differ by 9.
%C Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 5.
%e 7767//7770 = 8810 * 8817, where // denotes concatenation.
%e 7767//7762 = 8809 * 8818.
%e 7767//7776 = 8811 * 8816.
%Y Cf. A116167, A116179, A116181, A116133, A116311.
%Y Cf. A116114, A116126, A116133, A116258.
%Y Cf. A116207, A116187, A116174, A116351.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
%E Edited by _N. J. A. Sloane_, Apr 12 2007
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