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edited Feb 24, 2020 at 14:44

PHP, 38 bytes

while(($a=decbin$n=decbin(++$x))%$argn);echo$a;;echo$n;

Counts up n in binary and divides it's decimal representation by k until there is no remainder; indicating the first, smallest multiple.

while(($a=decbin(++$x))%$argn);echo$a;

while(($n=decbin(++$x))%$argn);echo$n;

Counts up n in binary and divides it's decimal representation by k until there is no remainder; indicating the first, smallest multiple.

answered Feb 24, 2020 at 12:31

while(($a=decbin(++$x))%$argn);echo$a;