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%I #6 Jul 19 2021 22:36:08
%S 16,36,12366,42036,64996,1589736168,1921234732,3154856388,3615437032,
%T 5939192968,6565302732,1888656611704713276,2251541774559900786,
%U 2761459004510103616,3196921199936328628,63080834574071218603723158
%N Numbers k such that k concatenated with k+4 gives the product of two numbers which differ by 9.
%Y Cf. A116182, A116189, A116197, A116321.
%K nonn,base
%O 1,1
%A _Giovanni Resta_, Feb 06 2006
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