142657-21-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 142657-21-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,5 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 142657-21:
(8*1)+(7*4)+(6*2)+(5*6)+(4*5)+(3*7)+(2*2)+(1*1)=124
124 % 10 = 4
So 142657-21-4 is a valid CAS Registry Number.