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function is_prime(n)
assert(type(n) == 'number', 'n must be a number!')
if n <= 1 then return false end
for i=2,math.sqrt(n) do
if n % i == 0 then return false end
end
return true
end
function reverse(n)
assert(type(n) == 'number', 'n must be a number!')
local rev = 0
while n ~= 0 do
rev = (rev * 10) + (n % 10)
n = n // 10
end
return rev
end
for i=1, 1000 do
if i == reverse(i) and is_prime(i) then
io.write(i, ' ')
end
end
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