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Question Number 3595 by Filup last updated on 16/Dec/15
I just thought of something I am curious  in figuring out.    All integer numbers can be made up by  prime factors. That is:  n=p_1 ×p_2 ×...×p_i   n∈Z         p_k ∈P    Are there an inifinite number of numbers  that are the sum of prime numbers?  That is:  P=p_1 +p_2 +...+p_i   P,p_k ∈P    For example:  2+3=5  2+3+3+5=13  etc.    Are all of these special primes odd?  What else can we work out?
IjustthoughtofsomethingIamcuriousinfiguringout.Allintegernumberscanbemadeupbyprimefactors.Thatis:n=p1×p2××pinZpkPArethereaninifinitenumberofnumbersthatarethesumofprimenumbers?Thatis:P=p1+p2++piP,pkPForexample:2+3=52+3+3+5=13etc.Areallofthesespecialprimesodd?Whatelsecanweworkout?
Commented by Yozzii last updated on 16/Dec/15
I think your question is a case  of the abc conjecture which hasn′t  been neatly proven yet.
Ithinkyourquestionisacaseoftheabcconjecturewhichhasntbeenneatlyprovenyet.
Commented by Yozzii last updated on 16/Dec/15
abc conjecture:    For any infinitesimal ε>0 there  exists a constant C_ε  such that, for  a,b,c being coprime satisfying       a+b=c,  the inequality       max(∣a∣,∣b∣,∣c∣)≤C_ε Π_(p∣abc) p^(1+ε)   holds, where p∣abc is the product over  primes p which divide the product abc.
abcconjecture:Foranyinfinitesimalϵ>0thereexistsaconstantCϵsuchthat,fora,b,cbeingcoprimesatisfyinga+b=c,theinequalitymax(a,b,c)Cϵpabcp1+ϵholds,wherepabcistheproductoverprimespwhichdividetheproductabc.
Commented by Filup last updated on 16/Dec/15
Oh? What is that?
Oh?Whatisthat?
Commented by Filup last updated on 16/Dec/15
if P∈E:  Σ_(k=1) ^i p_k =P         P∈E  ∴Σ=2i   ∵if P∈E, P=2+2+2+...  (even = even + even)  (2 is only even prime)  P=2i    i∈Z  ∴P∉P    ∴all special primes are odd  correct?
ifPE:ik=1pk=PPEΣ=2iifPE,P=2+2+2+(even=even+even)(2isonlyevenprime)P=2iiZPPallspecialprimesareoddcorrect?
Commented by prakash jain last updated on 16/Dec/15
I thought what Filup is asking is:  Can every prime (≥5) be expressed as sum of  more than 2 primes:  5=2+3  7=2+2+3  11=7+2+2
IthoughtwhatFilupisaskingis:Caneveryprime(5)beexpressedassumofmorethan2primes:5=2+37=2+2+311=7+2+2
Commented by Filup last updated on 16/Dec/15
Yes, that is a part of what im asking
Yes,thatisapartofwhatimasking
Commented by Filup last updated on 16/Dec/15
I have proven that all special primes are  odd.  But can all primes be written by the  sum of other primes??
Ihaveproventhatallspecialprimesareodd.Butcanallprimesbewrittenbythesumofotherprimes??
Commented by 123456 last updated on 16/Dec/15
if there is a infinite number of twin primes  then there a infinite number of primes  that can be write by sum of two or more  prime number
ifthereisainfinitenumberoftwinprimesthenthereainfinitenumberofprimesthatcanbewritebysumoftwoormoreprimenumber
Commented by 123456 last updated on 16/Dec/15
add a 3 and you can generate all numbers ≥2  2i+3j  00 02 04 06 08 10 …  03 05 07 09 11 13 …  06 08 10 12 14 16 …  09 11 13 15 17 19 …  12 14 16 18 20 22 …  15 17 19 21 23 25 …  ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋱
adda3andyoucangenerateallnumbers22i+3j000204060810030507091113060810121416091113151719121416182022151719212325
Commented by prakash jain last updated on 16/Dec/15
So all numbers (including primes) can be  written a sum of 2 or more primes.
Soallnumbers(includingprimes)canbewrittenasumof2ormoreprimes.

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