OFFSET
1,1
COMMENTS
All terms are powerful (A001694).
EXAMPLE
64 is a term because a solution exists at k=64, w=32, x=32, y=8, z=8:
k = w + x = y*z with w*x = k*(y+z)
becomes
64 = 32 + 32 = 8*8 with 32*32 = 64*(8+8).
PROG
(PARI) is(k) = fordiv(k, y, if(issquare(k^2 - 4*k*(y+k/y)), return(1))); 0; \\ Jinyuan Wang, May 01 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Naohiro Nomoto, Sep 23 2000
EXTENSIONS
More terms from Jinyuan Wang, May 01 2021
STATUS
approved