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  2. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89: Largest base for which all left-truncatable primes are known. 90: Nonagesimal: Related to Goormaghtigh conjecture for the generalized repunit numbers (111 in base 90 = 1111111111111 in base 2). 95: Number of printable ASCII characters ...

  4. List of British bingo nicknames - Wikipedia

    en.wikipedia.org/wiki/List_of_British_bingo...

    The number 2 looks like a duck (see '2') and the number 7 looks like a crutch. Gateway to Heaven Rhymes with "twenty-seven". 28 In a state "Two and eight" is rhyming slang for "state". Overweight Rhymes with "twenty-eight". 29 Rise and shine Rhymes with "twenty-nine". 30 Dirty Gertie [1]

  5. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    English number words include numerals and various words ... 20: twenty: 3: three: 13: thirteen (a baker's ... the .30-06 Springfield rifle cartridge and by ...

  6. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    In combinatorics, 20 is the number of distinct combinations of 6 items taken 3 at a time. Equivalently, it is the central binomial coefficient for n=3 (sequence A000984 in the OEIS). In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13). [citation needed]

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  8. 30 (number) - Wikipedia

    en.wikipedia.org/wiki/30_(number)

    It has an aliquot sum of 42; within an aliquot sequence of thirteen composite numbers (30, 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0) to the Prime in the 3-aliquot tree. From 1 to the number 30, this is the longest Aliquot Sequence. It is also: A semiperfect number, since adding some subsets of its divisors (e.g., 5, 10 and 15 ...

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