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Emir P. Prime (Posted on 2007-04-19) Difficulty: 2 of 5

Can you identify the five-digit sphenic palindrome

  • where the sum of its digits is a palindromic prime,
  • where of one its factors is a multi-digit palindromic prime, and
  • the sum of its factors is also a palindromic prime?

Can you identify any other sphenic palindrome that has these characteristics?

A sphenic number is a positive integer and product of three distinct primes.
A palindromic number is a number that is the same when written forwards or backwards.

See The Solution Submitted by Dej Mar    
Rating: 4.3333 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Analytic Solution | Comment 4 of 5 |
(In reply to re: Analytic Solution by Charlie)

Thanks, Charlie! You are, of course, absolutely correct - I didn't read the problem carefully enough. How embarrassing.

Still, that list of feasible palindromes is small enough to be culled to the real solution quite quickly, using only a table of primes and factors.

J.


  Posted by JayDeeKay on 2007-04-19 15:28:52
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