A little number grid for preschool math exercises at home

num.lua

-- To run:
--   Download LÖVE from https://love2d.org
--   Download this file to a directory and rename it to `main.lua`
--   Run the program from that directory.
--     * on Linux (using the appimage binary): `chmod +x path/to/love-11.4-x86_64.AppImage; path/to/love-11.4-x86_64.AppImage .`
--     * on Mac: `path/to/love.app/Contents/MacOS/love .`

local circle = love.graphics.circle
local color = love.graphics.setColor
local rect = love.graphics.rectangle
local keyboard = love.keyboard

function love.load()
  love.window.setMode(1280, 720)
  love.window.setTitle('Number grid')
end

function love.update(dt)
end

function find(table, val)
  for _, x in ipairs(table) do
    if x == val then
      return true
    end
  end
  return false
end

function love.draw()
  local x, y = 56, 56
  local primes={2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 53, 59, 61, 71, 73, 79, 83, 89, 97}
  for i=1,100 do
    if
--?       false
--?       i%10 == 1
--?       math.floor(math.sqrt(i)) == math.sqrt(i)
      find(primes, i)
    then
      color(0, 0.4, 0)
    else
      color(0.5, 0.5, 0.5)
    end
    love.graphics.rectangle('fill', x-4, y-4, 52, 44)
    color(1, 1, 1)
    love.graphics.print(tostring(i), x, y, 0, 2)
    if i%10 == 0 then
      y = y + 56
      x = 56
    else
      x = x + 56
    end
  end
end