1857-81-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1857-81-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,5 and 7 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1857-81:
(6*1)+(5*8)+(4*5)+(3*7)+(2*8)+(1*1)=104
104 % 10 = 4
So 1857-81-4 is a valid CAS Registry Number.