OFFSET
1,1
COMMENTS
Is this list infinite?
a(19) > 3.5 * 10^8. - Delbert L. Johnson, May 04 2024
LINKS
Math Pickle, Big Square Mini Mathematical Universe, YouTube video.
EXAMPLE
14 is a term because there are no solutions to 14 = i^2 + j*k with i >= j >= k >= 0. Specifically 14 = 3^2 + 5*1 is not a solution because 5 > 3.
117 is not a term because 117 = 9^2 + 6*6.
118 is not a term because 118 = 10^2 + 9*2 (also 118 = 10^2 + 6*3).
PROG
(PARI) isok(n)={for(k=sqrtint(n\2), sqrtint(n), my(r=n-k^2); if(r==0, return(0)); fordiv(r, d, if(d<=k && r/d<=k, return(0)))); 1}
select(isok, [1..2000]) \\ Andrew Howroyd, Mar 24 2023
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gordon Hamilton, Mar 24 2023
EXTENSIONS
a(11)-a(18) from Andrew Howroyd, Mar 24 2023
STATUS
approved