December 13th, 2014, 01:09 PM  #1 
Senior Member Joined: Nov 2013 From: Germany Posts: 179 Thanks: 1 Math Focus: Number Theory  Twin prime formulas ?!
((y^2x^2)^n+x (xy)^n+y (xy)^n)/((xy) (x+y)) = 4^(n) (x^2y^2)^n n out of N The system gives some twin prime solutions for x,y Where can i find better ones? Thx 
December 13th, 2014, 02:46 PM  #2 
Senior Member Joined: Aug 2008 From: Blacksburg VA USA Posts: 346 Thanks: 6 Math Focus: primes of course 
seems like overkill. From OEIS A014574 comments, TP pairs can be found from centers n where sigma(n1)=phi(n+1). An example is 1260768 yielding (1260767,1260769). Pari and other programs have those functions (for Pari, sigma, eulerphi)


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formulas, prime, twin 
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