Description: Temporary duplicate of tgoldbachgt , provided as "axiom" as long as
this theorem is in the mathbox of Thierry Arnoux: Odd integers greater
than ( ; 1 0 ^ ; 2 7 ) have at least a representation as a sum of
three odd primes. Final statement in section 7.4 of Helfgott p. 70 ,
expressed using the set G of odd numbers which can be written as a
sum of three odd primes. (Contributed by Thierry Arnoux, 22-Dec-2021)