OFFSET
1,4
COMMENTS
a(n) = n-k for the least k >= A007947(n) such that n-k and n-(sigma(n)-k) are relatively prime.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..16384
Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537
PROG
CROSSREFS
KEYWORD
sign
AUTHOR
Antti Karttunen, May 31 2019
STATUS
approved