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Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 2.
5

%I #6 Jul 20 2021 23:47:39

%S 205,300,477,732,1920,3157,52896,120085,427020,8264460,88581312,

%T 112000885,112917765,143075580,152863360,193537077,233788192,

%U 266755221,313680096,370908477,386568925,440852992,442670220

%N Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 2.

%Y Cf. A115426, A116099, A116112, A115428, A116308.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006