661-38-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 661-38-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,6 and 1 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 661-38:
(5*6)+(4*6)+(3*1)+(2*3)+(1*8)=71
71 % 10 = 1
So 661-38-1 is a valid CAS Registry Number.