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Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 2.
4

%I #8 Jul 21 2021 22:45:29

%S 2137,2892,6369,12217,21964,28233,42312,4978977,9571608,18642249,

%T 32288908,96039609,200037461217,305526508312,570666416233,

%U 638912248204,996003996009,1846991026584,3251664327537,4859838227992

%N Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 2.

%C If k-9 and k-8 have the same number of decimal digits, and k is in A115435, it also is in this sequence (and vice versa). - _R. J. Mathar_, Aug 09 2010

%e 96039609//96039600 = 97999800 * 97999802, where // denotes

%e concatenation.

%Y Cf. A116094, A116096, A116102, A116226.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006