A116261 - OEIS

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A116261

Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-4.

%I #13 Jul 18 2021 06:49:08

%S 7,97,766,857,909,997,3284,6712,9997,45451,54545,99997,990099,999997,

%T 8181818,9999997,70588232,99999997,343130553,362637362,363636360,

%U 420053630,421052631,497975708,502024288,578947365,579946366

%N Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-4.

%Y Cf. A028557, A116130, A116255, A116260, A116262, A116268.

%K nonn,base

%O 1,1

%A _Giovanni Resta_, Feb 06 2006