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Minimal Primes (Posted on 2012-04-24) Difficulty: 3 of 5
409 is an interesting prime number. If you remove any number of its digits, then you will get a number that is not prime.

4=2^2
0=not prime
9=3^2
40=2^3*5
49=7^2
09=9=3^2

Call a number with this property a minimal prime. Find all minimal primes.

No Solution Yet Submitted by Math Man    
Rating: 4.6667 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: of course it also inspires a computer programCharlie2012-04-24 17:28:34
re: solutionMath Man2012-04-24 17:26:45
of course it also inspires a computer programCharlie2012-04-24 16:50:53
SolutionsolutionCharlie2012-04-24 16:17:04
SolutionspoilerAdy TZIDON2012-04-24 10:37:58
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