all_numbers = []

1.upto(2600) do |j|
     1.upto(10) do |i|
            if j % i == 0
                all_numbers << j
                end
     end
end

result = all_numbers.select{|element| all_numbers.count(element) > 9 }
p result[0]

all_numbers = []

1.upto(100000) do |j|
     1.upto(20) do |i|
            if j % i == 0
                all_numbers << j
                end
     end
end

result = all_numbers.select{|element| all_numbers.count(element) > 19 }
p result[0]