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  2. 85 (number) - Wikipedia

    en.wikipedia.org/wiki/85_(number)

    85 (eighty-five) is the natural number following 84 and preceding 86. ← 84 : 85: 86 → ... 85 is: the product of two prime numbers (5 and 17), ...

  3. Natural number - Wikipedia

    en.wikipedia.org/wiki/Natural_number

    The first ordinal number that is not a natural number is expressed as ω; this is also the ordinal number of the set of natural numbers itself. The least ordinal of cardinality ℵ 0 (that is, the initial ordinal of ℵ 0 ) is ω but many well-ordered sets with cardinal number ℵ 0 have an ordinal number greater than ω .

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    85: Ascii85 encoding. 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

  5. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. ... Jacobsthal numbers: 0, 1, 1, 3, 5, 11, 21, 43, 85, 171 ...

  6. 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.

  7. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    The natural numbers form a subset of the integers. ... = 6.85 and 6.850000000000... = 6.85. Finally, if all of the digits in a numeral are 0, the number is 0, and if ...

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  9. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]