The CAS Registry Mumber 29586-31-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,5,8 and 6 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 29586-31: (7*2)+(6*9)+(5*5)+(4*8)+(3*6)+(2*3)+(1*1)=150 150 % 10 = 0 So 29586-31-0 is a valid CAS Registry Number.