2 lines
353 B
Markdown
2 lines
353 B
Markdown
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The approach for this problem is to first iterate through the left-truncatable primes and test if these are right-truncatable. All with the help of our trusty companion the *sieve of Eratosthenes*.
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Tricky was that the generation of left-truncatable primes, my original algorithm was recursive and I had to transform it to an iterative one for befunge.
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