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minimal prime
Every prime number, when written in base ten, has one of the following primes as a substring:
2, 3, 5, 7, 11, 19, 41, 61, 89, 409, 449, 499, 881, 991, 6469, 6949, 9001, 9049, 9649, 9949, 60649, 666649, 946669, 60000049, 66000049, 66600049These are the minimal primes. A string a is a substring of another string b, if a can be obtained from b by deleting zero or more of the characters in b. For example, 392 is a substring of 639802.
Related category
• PRIME NUMBERS
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