观察：1*2*3*4+1=5*5

(1)
n * (n+1) * (n+2) * (n+3) + 1 = (n(n+3) + 1)^2
证明：
(n(n+3) + 1)^2
= (n^2 + 3n + 1)^2
= n^4 + 9n^2 + 1 + 6n^3 + 2n^2 + 6n
= n^4 + 6n^3 + 11n^2 + 6n + 1
= (n^2 + n)*(n^2 + 5n + 6) + 1
= n(n+1)(n+2)(n+3) + 1
(2)
2010*2011*2012*2013 + 1
= (2010 * 2013 + 1)^2
= 4046131^2
再问： ∧什么意思？