Brain Teasers
The Order
There is a five-digit number having digits 1-9, no two digits being identical. Two are prime numbers, two are square numbers, and one is neither. The third digit is twice the fifth, the fourth is six greater than the second and the last is three less than the first.
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43291
rememeber 1 is not a prime number. Is it considered a square though?
rememeber 1 is not a prime number. Is it considered a square though?
Jun 29, 2004
what is square number?
i thought square number is 1,4,9.. with that assumption i got one answer
53492
i thought square number is 1,4,9.. with that assumption i got one answer
53492
Neither of the commented solutions work. The first has 3 square numbers namely 1 , 4 , 9. The second has 3 prime numbers and 2 squares but the puzzle says that one of the digits is neither.
What can i say Nice 1 but old fashioned
I see no other way of solving this other than figuring out which numbers are possible for each position and then proceeding by trial and error. Fun though
Excellent teaser; my kind of puzzle.
Seems like there's not enough information for a unique answer, but the clues very elegantly eliminate all other possibilites.
Seems like there's not enough information for a unique answer, but the clues very elegantly eliminate all other possibilites.
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