Truncatable primes: Difference between revisions

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== {{header|J}} ==
== {{header|J}} ==


Truncatable primes may be constructed by starting with a set of one digit prime numbers and then repeatedly adding a non-zero digit (using the cartesian product of digit sequences) and, at each step, selecting the prime numbers which result.
Truncatable primes may be constructed by starting with a set of one digit prime numbers and then repeatedly adding a non-zero digit (combine all possibilities of a truncatable prime digit sequence with each digit) and, at each step, selecting the prime numbers which result.


In other words, given:
In other words, given: