20190416, 20:55  #1 
Mar 2019
110111_{2} Posts 
I think I have a conjecture
I have been studying some kind of numbers, the numbers that I have analyzed are of the form k*2^n3 that never yield composite numbers and where k is a positive odd integer and I conjectured that 121 is the smallest k that never yields a prime number of the form k*2^n3
Why do I think this conjecture is true? Well, I have checked n for 121 up to 31 and have not found any prime number. Thank you for reading. If you have any counterexamples, critics (as always ������), or ideas leave them in the comments please Last fiddled with by Batalov on 20190416 at 22:36 Reason: post is completely replaced by MathDiggy. Attached is the screenshot of the original post 
20190416, 20:59  #2 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
242E_{16} Posts 
Ahem....
x^ny^n=z^n also means (rearranging...) x^n=z^n+y^n Doesn't it remind us anything? 
20190416, 21:05  #3 
Mar 2019
5·11 Posts 

20190416, 21:06  #4 
Mar 2019
5·11 Posts 

20190416, 21:11  #5 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
22056_{8} Posts 

20190416, 21:18  #6 
Mar 2019
5×11 Posts 
The ????? sign is a laugh emoji

20190416, 21:21  #7 
Mar 2019
5·11 Posts 

20190416, 21:23  #8 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2×11×421 Posts 
I am not laughing  I don't even see your posts anymore. You are now on my "Ignore" list.
Bye! Of note: the original post was replaced full length with some other noise (fiddled by MathDoggy on 20190416 at 13:18 ). That's not what people usually do here. Here is the screenshot of the original posting. 
20190416, 21:25  #9 
Mar 2019
5×11 Posts 

20190417, 02:33  #10  
Jan 2019
Pittsburgh, PA
2^{3}×31 Posts 
Quote:
Quote:
Quote:
Now, to show that 121 is the smallest k such that k*2^n3 is not prime, you first need to show that each 1<=k<121, k*2^n3 is not prime for every integer n>=0. Anyway, your assumption that \(121\cdot2^n3\) cannot be a prime is false since \(121\cdot2^{9}3=61949\) is a prime number. 

20190417, 04:10  #11 
"Curtis"
Feb 2005
Riverside, CA
3^{5}×19 Posts 
It's one thing to post nonsense and learn from the replies you get; it's quite another to remove your entire post and replace it with something fully unrelated after being shown that you don't understand addition and subtraction. For me, that sort of hiding from your own ineptitude and misrepresenting what you said deserves a ban from even misc.math subforum.

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