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Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 8.
5

%I #6 Jul 20 2021 23:47:56

%S 57,1062,4545,9517,65040816823705919148274557212824575357,

%T 73854453524198329292125744115286819630,

%U 78444109191135472482770868099397646205

%N Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 8.

%e 9517//9520 = 9752 * 9760, where // denotes concatenation.

%Y Cf. A116174, A116180, A116182, A116189, A116312.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006