SOLUTION: A cut-tail prime is a prime number that keeps giving prime numbers as its last digit is continually removed. For example, 37397 is a cut-tail prime because 37397 and 3739 and 373 a

Question 1187981: A cut-tail prime is a prime number that keeps giving prime numbers as its last digit is continually removed. For example, 37397 is a cut-tail prime because 37397 and 3739 and 373 and 37 and 3 are all primes. The number of three-digit cut-tail primes is
A)12 B)13 C)14 D)15 E)16
Found 3 solutions by ikleyn, MarkSingh-, Alan3354:
Answer by ikleyn(52782)   (Show Source): You can put this solution on YOUR website!
.

        14.             ANSWER

See this Wikipedia article

https://en.wikipedia.org/wiki/Truncatable_prime

where ALL 83 EXISTING right-truncatable primes are listed.

Of them, there are exactly 14 three-digit numbers.

         //     Kind of useless knowledge which gives NOTHING and teaches NOTHING.

Answer by MarkSingh-(4)   (Show Source): You can put this solution on YOUR website!
Three-digit cut-tail primes:
233, 239, 293, 311, 313, 317, 373, 379, 593, 599, 719, 733, 739, 797 = 14
numbers
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
You never outgrow your need for useless facts.
Or, as the Warrant Officer in Catch 22, said, "Who gives a shit?"
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