1.The number is an integer
2.The number is not prime
3.The number is not even
4.The number is not under 5000
5.The number is divisible by another four-digit number
6.The number is between 7500-10000
7.The number is not divisible by 3 or 7
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8.
Is the first digit a prime number? No
Is it even? No
Is the second digit prime? Yes
Is it even? No
Is the third digit prime? No
Even? Yes
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So far:
Xena got it down to six numbers whereas I got it down to 5 numbers (9705 is divisible by three)
My numbers were:
9305
9365
9385
9745
9785
then these questions were asked and answered:
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9.
Within its prime factors; are any numbers repeated?
(e.g. 5619 = 1873 x 3. 3 is repeated. 3891 = 3 x 1297. No numbers are repeated?) no
Does the number contain a 7? maybe
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10.
Does it contain the number 9? Yes
Is the last number prime? Yes
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Prime Factors ------ Number -- Sum of digits -- Sum of(sum of digits)
5.............. 1861........ 9305........... 17............ 8
5.............. 1873........ 9365........ 23............ 5
5.............. 1877........ 9385........ 25............ 7
5.............. 1949........ 9745........ 25............ 7
5*19*103. 1957........ 9785........ 29............ 11
So I asked the following:
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11. Is the sum of the individual digits of the number, a prime number? YES
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The following numbers are ruled OUT: (reason given by question number)
Prime Factors ------ Number -- Sum of digits -- Sum of(sum of digits)
5.......... 1877........ 9385........ 25............ 7.......... (#11)
5............. 1949........ 9745......... 25............ 7.......... (#11)
5*19*103. 1957........ 9785........ 29............ 11.......... (#9)
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12. If this sum is a prime number, are the sum of the digits of that sum, also a prime number? YES
Prime Factors ------ Number -- Sum of digits -- Sum of(sum of digits)
5.............. 1861........ 9305........ 17............ 8
5.............. 1873........ 9365........ 23............ 5
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MY Guess the Number Answer is 9365
Quote:
Matt wrote:
Is the number 9365?
Nope. Sorry
Cannot see where in my calculations that 9365 is incorrect *shrug*