Conundrum: Non-Prime
I’m thinking of a two-digit number that is not a prime, the sum of two primes, or the product of two primes.
What number am I thinking of?
UPDATE: Question answered by Bronx Richie. See comments for answer.
I’m thinking of a two-digit number that is not a prime, the sum of two primes, or the product of two primes.
What number am I thinking of?
UPDATE: Question answered by Bronx Richie. See comments for answer.
This entry was posted on Tuesday, July 22nd, 2008 at 6:33 am and is filed under Conundrum, Math. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
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August 8th, 2008 at 10:52 pm
now THAT’s an easy one…
you’re thinking of 21…
i.e. not prime as it has non-1 and non-21 factors i.e. 7 ^ 3
product of two primes: 7, 3
sum of 2 primes: 19, 2
BUT you could also be thinking of 14
i.e. not prime as it has non-1 and non-14 factors i.e. 7 ^ 2
product of two primes: 7, 2
sum of 2 primes: 11, 3
Or maybe 91?
i.e. not prime as it has non-1 and non-91 factors i.e. 13 ^ 7
product of two primes: 13, 7
sum of 2 primes: 89, 2
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.
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BASICALLY YOUR QUESTION LACKS A UNIQUE SOLUTION. OR DID I INTERPRET THY QUESTION WRONGLY? (:
Nice blog, btw!
August 8th, 2008 at 11:52 pm
Welcome, Tuna!
I meant that number is not prime, it is not the sum of two primes, and it is not the product of two primes.
There is only one two-digit number that meets these three conditions.
November 24th, 2008 at 1:05 am
27 seems to meet all your requirements.
November 24th, 2008 at 8:19 pm
Indeed it does. Nice work, Bronx Richie!