Contact us
Choose a category below so we can get back to you as quickly as possible.
1=0×1+1,3=1×2+1,7=2×3+1,……,第N個是N×(N-1)+1,所以第2008個是2008×2007+1=4030057.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.