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Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 5.
6

%I #6 Jul 20 2021 23:47:44

%S 1,3,81,1353,3997,7723,23761,26271,76771,1415683,3890571,8495497,

%T 1066870443,1239366513,4198438981,4534273891,6502317141,6918679731,

%U 2199164200036329043,2820114781174460091,5500888421709400741

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

%Y Cf. A116172, A116112, A116180, A116193, A116310.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, Feb 06 2006