xx="1234567890"
encoded = ""
for i = 1, #xx do
local original_byte = (string.byte(xx, i) - 5*(i % 3)) % 256
encoded = encoded .. string.format("\\%03d", original_byte)
end
print(encoded)
eHg9IjEyMzQ1Njc4OTAiCmVuY29kZWQgPSAiIgpmb3IgaSA9IDEsICN4eCBkbwogICAgbG9jYWwgb3JpZ2luYWxfYnl0ZSA9IChzdHJpbmcuYnl0ZSh4eCwgaSkgLSA1KihpICUgMykpICUgMjU2CiAgICBlbmNvZGVkID0gZW5jb2RlZCAuLiBzdHJpbmcuZm9ybWF0KCJcXCUwM2QiLCBvcmlnaW5hbF9ieXRlKQogICAgZW5kCnByaW50KGVuY29kZWQpCg==