20101110, 19:30  #34 
Aug 2006
3·1,993 Posts 

20101110, 20:26  #35 
"Forget I exist"
Jul 2009
Dumbassville
8384_{10} Posts 

20101111, 01:32  #36 
May 2010
Prime hunting commission.
2^{4}·3·5·7 Posts 

20101111, 04:22  #37 
Aug 2006
3×1,993 Posts 

20101111, 04:42  #38 
May 2010
Prime hunting commission.
2^{4}×3×5×7 Posts 

20101111, 04:55  #39 
Aug 2006
175B_{16} Posts 
The antecedents, of course  you could easily reverse them.
Last fiddled with by CRGreathouse on 20101111 at 05:10 
20101112, 15:44  #40 
"Forget I exist"
Jul 2009
Dumbassville
2^{6}·131 Posts 
could we add sumdigits(sumdigits(x)+sundigits(y)) = sumdigits(x*y) into the first theory ? I think it works can anyone help prove it ?.

20101112, 19:43  #41 
Aug 2006
13533_{8} Posts 
What are x and y? (Remember: when you're asking for help you need to be specific!)

20101112, 20:01  #42 
"Forget I exist"
Jul 2009
Dumbassville
20C0_{16} Posts 
for example 2047 = 23*89
2+4+7=4 mod 9 2+3+8+9 = 4 mod 9 5+8 = 4 mod 9 so the sumdigits for each multiplier 2kp+1 summed together gives the same as the sumdigits for 2^p+1. 
20101112, 20:03  #43 
Aug 2006
1011101011011_{2} Posts 
So... what are x and y?

20101112, 20:03  #44 
"Forget I exist"
Jul 2009
Dumbassville
2^{6}×131 Posts 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Mersenne Primes p which are in a set of twin primes is finite?  carpetpool  Miscellaneous Math  3  20170810 13:47 
Distribution of Mersenne primes before and after couples of primes found  emily  Math  34  20170716 18:44 
Mersenne primes and class field theory  Nick  Math  4  20170401 16:26 
Basic Number Theory 11: Gaussian primes  Nick  Number Theory Discussion Group  0  20161203 11:42 
Mersenne Wiki: Improving the mersenne primes web site by FOSS methods  optim  PrimeNet  13  20040709 13:51 