MORE SMARANDACHE CONJECTURES ON PRIMES' SUMMATION
(GENERALIZATIONS OF GOLDBACH AND POLIGNAC CONJECTURES)
edited by M. L. Perez
&1. ODD NUMBERS.
A) Any odd integer n can be expressed as a combination
of three primes as follows:
1) As a sum of two primes minus another prime (k=3, s=1):
n = p+q-r, where p, q, r are all prime numbers.
Do not include the trivial solution: p = p+q-q when p is prime.
For example: 1 = 3+5-7 = 5+7-11 = 7+11-17 = 11+13-23 = ... ;
3 = 5+5-7 = 7+19-23 = 17+23-37 = ... ;
5 = 3+13-11 = ... ;
7 = 11+13-17 = ... ;
9 = 5+7-3 = ... ;
11 = 7+17-13 = ... .
a) Is this conjecture equivalent with Goldbach's Conjecture
(any odd integer >=9 is the sum of three primes)?
b) Is the conjecture true when all three prime numbers are different?
c) In how many ways can each odd integer be expressed as above?
2) As a prime minus another prime and minus again another
prime (k=3, s=2):
n = p-q-r, where p, q, r are all prime numbers.
For example: 1 = 13-5-7 = 17-5-11 = 19-5-13 = ... ;
3 = 13-3-7 = 23-7-13 = ... ;
5 = 13-3-5 = ... ;
7 = 17-3-7 = ... ;
9 = 17-3-5 = ... ;
11 = 19-3-5 = ... .
a) Is this conjecture equivalent with Goldbach's Conjecture
(any odd integer >=9 is the sum of three primes)?
b) Is the conjecture true when all three prime numbers are different?
c) In how many ways can each odd integer be expressed as above?
Vinogradov proved in 1937 that every sufficiently large odd number k
is the sum of three odd primes, therefore k = p+q+r, where p, q, r are
primes.
B) Any odd integer n can be expressed as a combination of
five primes as follows:
3) n = p+q+r+t-u, where p, q, r, t, u are all prime numbers,
and t <> (different from) u. [k=5, s=1]
For example: 1 = 3+3+3+5-13 = 3+5+5+17-29 = ... ;
3 = 3+5+11+13-29 = ... ;
5 = 3+7+11+13-29 = ... ;
7 = 5+7+11+13-29 = ... ;
9 = 7+7+11+13-29 = ... ;
11 = 5+7+11+17-29 = ... .
a) Is the conjecture true when all five prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
4) n = p+q+r-t-u, where p, q, r, t, u are all prime numbers,
and t, u <> p, q, r. [k=5, s=2]
For example: 1 = 3+7+17-13-13 = 3+7+23-13-19 = ... ;
3 = 5+7+17-13-13 = ... ;
5 = 7+7+17-13-13 = ... ;
7 = 5+11+17-13-13 = ... ;
9 = 7+11+17-13-13 = ... ;
11 = 7+11+19-13-13 = ... .
a) Is the conjecture true when all five prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
5) n = p+q-r-t-u, where p, q, r, t, u are all prime numbers,
and r, t, u <> p, q. [k=5, s=3]
For example: 1 = 11+13-3-3-17 = ... ;
3 = 13+13-3-3-17 = ... ;
5 = 3+29-5-5-17 = ... ;
7 = 3+31-5-5-17 = ... ;
9 = 3+37-7-7-17 = ... ;
11 = 5+37-7-7-17 = ... .
a) Is the conjecture true when all five prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
6) n = p-q-r-t-u, where p, q, r, t, u are all prime numbers,
and q, r, t, u <> p. [k=5, s=4]
For example: 1 = 13-3-3-3-3 = ... ;
3 = 17-3-3-3-5 = ... ;
5 = 19-3-3-3-5 = ... ;
7 = 23-3-3-5-5 = ... ;
9 = 29-3-5-5-7 = ... ;
11 = 31-3-5-5-7 = ... .
a) Is the conjecture true when all five prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
Etc.
&2. EVEN NUMBERS.
A) Any even integer n can be expressed as a combination
of two primes as follows:
1) n = p - q, where p, q are both primes [k=2, s=1].
For example: 2 = 7 - 5 = 13 - 11 = ... ;
4 = 11 - 7 = ... ;
6 = 13 - 7 = ... ;
8 = 13 - 5 = ... .
a) Is it equivalent with Goldbach conjecture that every even number
greater than 4 is the sum of two odd primes?
b) In how many ways can each even integer be expressed as above?
B) Any even integer n can be expressed as a combination
of four primes as follows:
2) n = p + q + r - t, where all p, q, r, t are
primes [k=4, s=1].
For example: 2 = 3 + 3 + 3 - 7 = 3 + 5 + 5 - 11 = ... ;
4 = 3 + 3 + 5 - 7 = ... ;
6 = 3 + 5 + 5 - 7 = ... ;
8 = 11 + 5 + 5 - 13 = ... .
a) Is the conjecture true when all four prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
3) n = p + q - r - t, where all p, q, r, t are
primes [k=4, s=2].
For example: 2 = 11 + 11 - 3 - 17 = 11 + 11 - 13 - 7 = ... ;
4 = 11 + 13 - 3 - 17 = ... ;
6 = 13 + 13 - 3 - 17 = ... ;
8 = 11 + 17 - 7 - 13 = ... .
a) Is the conjecture true when all four prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
4) n = p - q - r - t, where all p, q, r, t are
primes [k=4, s=3].
For example: 2 = 11 - 3 - 3 - 3 = 13 - 3 - 3 - 5 = ... ;
4 = 13 - 3 - 3 - 3 = ... ;
6 = 17 - 3 - 3 - 5 = ... ;
8 = 23 - 3 - 5 - 7 = ... .
a) Is the conjecture true when all four prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
Etc.
GENERAL CONJECTURE:
Let k >= 3, and 1 <= s < k, be integers. Then:
i) If k is odd, any odd integer can be expressed as
a sum of k-s primes (first set) minus a sum of s primes
(second set)
[such that the primes of the first set is different from
the primes of the second set].
a) Is the conjecture true when all k prime numbers are different?
b) In how many ways can each odd integer be expressed as above?
ii) If k is even, any even integer can be expressed as
a sum of k-s primes (first set) minus a sum of s primes
(second set)
[such that the primes of the first set is different from
the primes of the second set].
a) Is the conjecture true when all k prime numbers are different?
b) In how many ways can each even integer be expressed as above?
References:
[1] Smarandache, Florentin, "Collected Papers", Vol. II, Kishinev
University Press, Kishinev, article ,
p. 190, 1997.
[2] Smarandache, Florentin, "Conjectures on Primes' Summation",
Arizona State University, Special Collections, Hayden Library,
Tempe, AZ, 1979.