OFFSET
1,1
COMMENTS
LINKS
Jon Perry, Anti-phi function [Wayback Machine link]
Jon Perry, The Anti-divisor [Cached copy]
Jon Perry, The Anti-divisor: Even More Anti-Divisors [Cached copy]
EXAMPLE
The anti-divisors of 7 are 1, 2, 3 and 5. Therefore of the integer 1-6, only 1 is coprime to 2, 3 and 5, therefore anti-phi(7)=1. phi(7)=6, therefore anti-phi(7)+phi(7)=7
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Jon Perry, Dec 28 2001
EXTENSIONS
a(21)-a(34) from Nathaniel Johnston, Apr 20 2011
a(35)-a(39) from Amiram Eldar, Jan 12 2020
STATUS
approved