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Line 5: C.f: [[Sieve of Eratosthenes]]; [http://mathworld.wolfram.com/TruncatablePrime.html Truncatable Prime] from Mathworld. == {{header\|J}} == <lang j> isprime=: 1&p: filterprimes=: #~ isprime primesbelow=: filterprimes@i.@- isprimeRT=: ([: ./@:isprime 0&".\)@":"0 isprimeLT=: ([: ./@:isprime 0&".\.)@":"0 ({~ i.&1@:isprimeLT) primesbelow 1e6 999907 ({~ i.&1@:isprimeRT) primesbelow 1e6 739399</lang> == {{header\|Python}} ==

Truncatable primes: Difference between revisions