eddyozzz

Thanks for the reply folks. As as example ; lets look at 9(which is an odd). We can write 2^3+1 = 9 since 1 isnt a prime it seems ok but ,9 can also be expressed 2^2+5 where 5 is a prime so since we have 1 set of expression with a prime ,that means 9 is not a strange number. Another example; 17 ; 2^3+9 is ok since 9 isnt a prime, 2^1+15 is ok, but 2^2+13 opps 13 is a prime so 17 can not be a strange number. I use mathemetica to come up with an answer to this becase thats where i got the definition to the strange number but i just can not put the codes together to come up with an strange numbers. It must be someting has to do with gcd(x,y)...

Hello everyone, I am a new member :) , I am trying to find the first 6 strange numbers, in the definition i have it says that an odd positive integer greater than 3 called strange number if it cant be expressed as the sum of a positive power of a 2 and a prime number.

Hi everyone, I was reading about the strange numbers and your great commands, one thing though. According to the definition I have; An odd positive integer greater then 3 is called a strange number if it can not be expressed as the sum of a positive power of 2 and a prime number. 24,30,42,54,66,78,102 all seem to be strange but they are not odd though...please correct me if i am wrong guys. I just have to find the first five strange numbers.