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The 16 digits on a credit card are divided into groups that each serve a different purpose. The first digit identifies the industry the card belongs to (banking, airline, etc). The next five digits identify the issuer of the card. The next nine digits are the owner's account number, and the final digit is a failsafe that completes the code. The reason many locations only ask for the end of the card is that the magnetic strip on the card also contains the number, and this is a quick method of ensuring the number on the card and the number on the strip match up.

Q: What is the purpose of the full CVV number if they only ever use the last three digits?

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A decimal fraction is said to be repeating if, after a finite number of digits, there is a string of a finite number of digits which repeats itself for ever more.For example,1537/700 = 2.19571428571428...The first three digits in the decimal representation are not part of the repeating pattern. After that, however, the string "591428" repeats endlessly.

You can never get to grahams number. Grahams number can never be specified. It is the biggest number ever counted.

It is an indication that the string of digits under the horizontal line repeats for ever.

A decimal is a rational number if it ever ends, or if it repeats the same single digit or set of digits forever.

Yes; by the definition of an irrational number (a number with an infinite amount of changing decimal digits as the number grows minutely larger), the converse is true about rational numbers a rational number like (1/3) [0.33333333...] can be notated with a bar over any of the digits to notate a repeating decimal digit.

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It is a non-terminating number (meaning it goes on and on and never ever stops). The first three digits are: 3.14

A decimal fraction is said to be repeating if, after a finite number of digits, there is a string of a finite number of digits which repeats itself for ever more.For example,1537/700 = 2.19571428571428...The first three digits in the decimal representation are not part of the repeating pattern. After that, however, the string "591428" repeats endlessly.

it is 17 million digits number, 257.885.161-1

You can never get to grahams number. Grahams number can never be specified. It is the biggest number ever counted.

If you mean the number pi, no. It has an infinite number of digits (in any base), and those are not periodic.

The largest known prime is (243,112,609 − 1) which has 12,978,189 digits when written out in full.

It is an indication that the string of digits under the horizontal line repeats for ever.

A decimal is a rational number if it ever ends, or if it repeats the same single digit or set of digits forever.

Li is atom number three, not only 'was' but it still is and ever will be.

no

If it ever ends, then it is.If there are no digits after the decimal point, it's an integer.

555 as the middle 3 digits in the phone number does not exist!. it is widely used in the movies so that no one ever calls that number. but i do not know anything about 337.