31821-11-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31821-11-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,2 and 1 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 31821-11:
(7*3)+(6*1)+(5*8)+(4*2)+(3*1)+(2*1)+(1*1)=81
81 % 10 = 1
So 31821-11-1 is a valid CAS Registry Number.