My Math Forum Strange observation with primes

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June 19th, 2009, 10:25 AM   #31
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Re: Strange observation with primes

Quote:
 Originally Posted by kaushiks.nitt I am sorry generating those few numbers don't appear that trivial .
Okay...? I don't know if you're ceding that your conjecture doesn't work out or claiming that it does.

I gave the code that generates that list. Even on a 10-year-old computer you should be able to generate it in seconds.

Here's improved code, by the way. My computer can get the 39,841 solutions of 55 iterations in about 10 seconds with it.
Code:
odd(v)=my(vv=[]);for(i=1,#v,if(v[i]%2,vv=concat(vv,v[i])));vv
step(vu)={my(v=vu[1],u=vu[2],uu=vector(#u,i,u[i]*2),t);for(i=1,#u,if(u[i]%3==2,t=(2*u[i]-1)/3;if(!isprime(t),uu=concat(uu,t))));[vecsort(concat(v,odd(u)),,8),vecsort(uu,,8)]}
go(n)=my(vu=[[],[5]]);for(i=1,n,vu=step(vu));vecsort(concat(vu[1],vu[2]),,8)
v=go(55);#v

 June 19th, 2009, 07:26 PM #32 Senior Member   Joined: Dec 2008 Posts: 206 Thanks: 0 Re: Strange observation with primes I am saying that the conjecture doesn't work and collatz has to be proved for all numbers just like the way it has been stated in the conjecture. Anyway thanks for the code. Cheers !!!

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