1×2×3×4+1==25=5²,2×3×4×5+1=121=11²,3×4×5×6+1=361=19&sup

问题描述:

1×2×3×4+1==25=5²,2×3×4×5+1=121=11²,3×4×5×6+1=361=19&sup
&sup2是平方2

n(n+1)(n+2)(n+3)+1=[n(n+3)+1]²
(n+1)(n+2)(n+3)(n+4)=[(n+1)(n+4)+1]² -1