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2018-02-24, 17:30   #23
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

26×131 Posts
https://oeis.org/draft/A158709

Quote:
 Apart from the first term, primes such that a Goldbach partition with a pair of them, will lead to a Goldbach partition for the next even number in their sums Collatz chain.
I was told to blog this in PM. Examples:

6=3+3 ->10=5+5; 10=3+7->16=5+11 did have a rough 21 digit example, but may have to find it again.

Quote:
 Example: 100000000000000008947+ 100000000000000008899 =200000000000000017846 ->150000000000000013349+150000000000000013421 =300000000000000026770

Last fiddled with by science_man_88 on 2018-02-25 at 01:13

 2018-06-14, 15:44 #24 science_man_88     "Forget I exist" Jul 2009 Dumbassville 26·131 Posts Code: my(a=0,b=[]);for(x=1,n,if((a-x)>0&&setminus(b,[a-x])==[],b=concat(b,[a-x]);a-=x;print(a),if(setminus(b,[a+x])==[],b=concat(b,[a+x]);a+=x;print(a),print("fails at x="x);break()))) Fails at x=26 apparently. Last fiddled with by science_man_88 on 2018-06-14 at 15:44
 2018-10-19, 23:00 #25 science_man_88     "Forget I exist" Jul 2009 Dumbassville 26×131 Posts Yes I'm weird Code: my(s=self());return(select(r->r=="e",Vec(Str(s)))) A code that searches itself.

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