13721-18-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 13721-18-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,7,2 and 1 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 13721-18:
(7*1)+(6*3)+(5*7)+(4*2)+(3*1)+(2*1)+(1*8)=81
81 % 10 = 1
So 13721-18-1 is a valid CAS Registry Number.