OFFSET
1,3
COMMENTS
LINKS
M. F. Hasler, Table of n, a(n) for n = 1..1000
PROG
(PARI) apply( {A257840(n, t)=for(x=n\4+1, 3*n\4, for(y=max(1\t=4/n-1/x, x)+1, ceil(2/t)-1, numerator(t-1/y)==1 && return(y)))}, [1..99]) \\ improved by M. F. Hasler, Jul 03 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, May 16 2015
STATUS
approved