1. ## hello~

anybody try solve this problem:
find all triples of positive integers(x,y,z) such that
x*y*z+x*y+y*z+z*x+x+y+z=243
tq

2. $xyz+xy+xz+yz+x+y+z=(x+1)(y+1)(z+1)-1=243$

so $(x+1)(y+1)(z+1)=244=2^2\cdot 61$

so we must have $x=1,y=1,z=60$.

Nice problem!