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  2. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...

  3. Prime-counting function - Wikipedia

    en.wikipedia.org/wiki/Prime-counting_function

    In mathematics, the prime-counting function is the function counting the number of prime numbers less than or equal to some real number x. [1] [2] It is denoted by π(x) (unrelated to the number π). A symmetric variant seen sometimes is π 0 (x), which is equal to π(x) − 1 ⁄ 2 if x is exactly a prime number, and equal to π(x) otherwise.

  4. Pivot table - Wikipedia

    en.wikipedia.org/wiki/Pivot_table

    Column labels are used to apply a filter to one or more columns that have to be shown in the pivot table. For instance if the "Salesperson" field is dragged to this area, then the table constructed will have values from the column "Sales Person", i.e., one will have a number of columns equal to the number of "Salesperson". There will also be ...

  5. Isopsephy - Wikipedia

    en.wikipedia.org/wiki/Isopsephy

    In numerology, isopsephy (/ ˈ aɪ s ə p ˌ s ɛ f i /; from Greek ἴσος (ísos) 'equal' and ψῆφος (psêphos) 'count', lit. ' pebble ') or isopsephism is the practice of adding up the number values of the letters in a word to form a single number. [1]

  6. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    A perfect totient number is an integer that is equal to the sum of its iterated totients. That is, we apply the totient function to a number n, apply it again to the resulting totient, and so on, until the number 1 is reached, and add together the resulting sequence of numbers; if the sum equals n, then n is a perfect totient number.

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  8. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

  9. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Thus 123.456 is considered an approximation of any real number greater or equal to ⁠ 1234555 / 10000 ⁠ and strictly less than ⁠ 1234565 / 10000 ⁠ (rounding to 3 decimals), or of any real number greater or equal to ⁠ 123456 / 1000 ⁠ and strictly less than ⁠ 123457 / 1000 ⁠ (truncation after the 3. decimal). Digits that suggest a ...