is this the "propper" way to find a key?

i have a table like this

local levs = {}

local maxlev = 50
local loops  = maxlev
local level = 1
local xp = 5

while loops > 0 do
	loops = loops - 1
	levs[level] = xp
	xp = math.floor(xp + (xp / 2))
	level = level + 1
end

this makes a table like

[1] = 5
[2] = 7
[3] = 10
[4] = 15
[5] = 23

and so on up to 50 im now needing to compare a value to the table and find a key that matches it for example if the input is 9 it ill read the table and find the last key that has a value less than 9 so in this case they key of 7 so it would return 2 and if the input was 16 it would return 4

i currently have this

_G.XPCheck = function(XP)
	local keycheck = 1
	if levs[keycheck] < XP then 
		keycheck = keycheck + 1
	else 
		return keycheck - 1
	end
end

is there a more propper way of doing this?

Ok, so I personally think that the best way to check a table is to use a for key, value do loop. It is great for iterating through a table.

local levs = {
[1] = 5;
[2] = 7;
[3] = 10;
[4] = 15;
[5] = 23;
}
    
    local XP = 10
    for Key, Value in pairs(levs) do
		wait(1)
	    if Value == XP then
			print("Correct Key! Key number "..Key.." is the right key!") 
	    else
			print("Wrong Key! Key number ".. Key.." is not the right key!")

		end
    end

Just one tiny problem: I don't know how to round the XP to the smaller value. I will work on that and try to figure it out.