17638-61-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17638-61-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,3 and 8 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 17638-61:
(7*1)+(6*7)+(5*6)+(4*3)+(3*8)+(2*6)+(1*1)=128
128 % 10 = 8
So 17638-61-8 is a valid CAS Registry Number.