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  2. Seven-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Seven-digit_dialing

    In seven-digit dialing, only the central office code and the station number is dialed, indicating that the call destination is within the local area code. This was the standard in most of North America from the 1950s onward. In some small villages with only one local exchange, it may have been permissible to dial only the four-digit station number.

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 32. Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89

  4. 7 - Wikipedia

    en.wikipedia.org/wiki/7

    7 (seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube . As an early prime number in the series of positive integers , the number seven has greatly symbolic associations in religion , mythology , superstition and philosophy .

  5. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    A circular prime number is a number that remains prime on any cyclic rotation of its digits (in base 10). ... (d = 1, 3, 7, 9) are primes ending in the decimal digit ...

  6. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    For example, if the threshold value for the first digit is b (i.e. 1) then a (i.e. 0) marks the end of the number (it has just one digit), so in numbers of more than one digit, first-digit range is only b–9 (i.e. 1–35), therefore the weight b 1 is 35 instead of 36.

  7. Palindromic number - Wikipedia

    en.wikipedia.org/wiki/Palindromic_number

    A number that is non-palindromic in all bases b in the range 2 ≤ b ≤ n − 2 can be called a strictly non-palindromic number. For example, the number 6 is written as "110" in base 2, "20" in base 3, and "12" in base 4, none of which are palindromes. All strictly non-palindromic numbers larger than 6 are prime.

  8. Numerical digit - Wikipedia

    en.wikipedia.org/wiki/Numerical_digit

    the 0 is immediately to the left of the separator, so it is in the ones or units place, and is called the units digit or ones digit; [6] [7] [8] the 1 to the left of the ones place is in the tens place, and is called the tens digit; [9] the 3 is to the right of the ones place, so it is in the tenths place, and is called the tenths digit; [10]

  9. Category:7 (number) - Wikipedia

    en.wikipedia.org/wiki/Category:7_(number)

    Pages in category "7 (number)" The following 24 pages are in this category, out of 24 total. This list may not reflect recent changes. 0–9. 7; A. Antillia; D.