21-23-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21-23-8 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 2 and 1 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21-23:
(4*2)+(3*1)+(2*2)+(1*3)=18
18 % 10 = 8
So 21-23-8 is a valid CAS Registry Number.