This means all digits except the middle digit are equal. Primes that remain prime when the leading decimal digit is successively removed. The remainder gives the second hexadecimal digit. Then replace each trio with the equivalent octal digit. Repunits are integers that are represented with only the digit 1. Note that there is a confusion about the glyph of Malayalam digit zero. A claw exists on each second digit of the feet. So the ISIN check digit is five. The name is a portmanteau of "binary digit". The thumb is the first digit (finger) of the hand. Write down that result below the digit. So the ISIN check digit is three. Set down that result on a line below that digit. The leading digit "1" of the result is then discarded. The precision is symmetric around the last digit.