OFFSET
1,1
COMMENTS
Least number k such that A066417(k)/k >= n.
LINKS
Jon Perry, The Anti-divisor
PROG
(PARI) a066417(n)=local(x); x=valuation(n, 2); sigma(2*n+1)+sigma(2*n-1)+sigma(n/2^x)*2^(x+1)-6*n-2
for(n=1, 3, for(k=3, 233415, if(a066417(k)/k>=n, print(n " " k); next(2))))
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Donovan Johnson, Aug 08 2012
STATUS
approved