OFFSET
1,1
LINKS
István B. Kolossváry and István T. Kolossváry, Distance between natural numbers based on their prime signature, Journal of Number Theory, Vol. 234 (2022), pp. 120-139; arXiv preprint, arXiv:2005.02027 [math.NT], 2020-2021.
FORMULA
Equals 1 + Sum_{k>=2} (1 - Product_{p prime} (1 - 2/p^k)). - Amiram Eldar, Jan 05 2024
EXAMPLE
2.2883695...
PROG
(PARI) 1 + sumpos(k = 2, 1 - prodeulerrat(1 - 2/p^k)) \\ Amiram Eldar, Jan 05 2024
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Michel Marcus, May 06 2020
EXTENSIONS
More terms from Amiram Eldar, Jan 05 2024
STATUS
approved