A previous paper submitted to viXra by the author on 2020-06-07 (1) and more specifically its paragraph 3-5 was related to the generation of primefree integer sequences using, as a seed, a prime numbers subset, a recursive algorithm and a specific formula described again in the next background section of this paper extending the initial work. Indeed, whereas two prime numbers seeds containing respectively the first 10^3 and 2*10^4 prime numbers were used in the initial study, the seed size range has been enlarged from 10^2 to 10^7 prime number terms. This allowed to confirm previous results and reinforced the so called primefree conjecture referenced CD-3 established from them. (1)This paper entitled "Structures and Properties of Integer Sequences generated from prime and nonprime number seeds"can be downloaded at: http://viXra.org/abs/2005.0056 under the viXra subject category: number theory and citation number: 2006.0056.