This is very similar to the decimal system, which is based on the number 10, and uses 10 digits. The ten lowest natural numbers (starting with 0) are used. Similarly, in a base-2 system, you would require two digits, starting with 0 - that is, zero and one.
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Binary.
prime numbers only be used as encryption keys as in encryption the numbers are coded inj the form of 0s and 1s ,i.e binary form.
No, 0101111 is not a binary number. Binary numbers are composed of only 0s and 1s, representing the base-2 numeral system. The presence of the leading zero in 0101111 suggests that it may be a binary number, but the inclusion of the digit 2 (represented as '11' in binary) indicates it is not a valid binary representation.
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A denary number is a number based on the ten digits, from 0 to 9. This is in contrast to the binary system used in computing, which consists entirely of 0s and 1s.