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A116273 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-2. 4

%I #12 Jul 18 2021 02:51:26

%S 90,9078,9900,733673,999000,88225294,99990000,8900869207,9296908811,

%T 9604060396,9999900000,326666333266,673333666733,700730927007,

%U 972603739726,999999000000,34519562953736,39737862788837

%N Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-2.

%e 90 is a member since 90*92 = 8280 = 82 80.

%e 9078 is a member since 9078*9080 = 82428240 = 8242 8240.

%Y Cf. A054214, A116266, A116272, A116274, A116279.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006

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Last modified May 21 15:14 EDT 2024. Contains 372738 sequences. (Running on oeis4.)