21005-31-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21005-31-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,0 and 5 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21005-31:
(7*2)+(6*1)+(5*0)+(4*0)+(3*5)+(2*3)+(1*1)=42
42 % 10 = 2
So 21005-31-2 is a valid CAS Registry Number.