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  2. 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.

  3. Boltzmann constant - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_constant

    Based on these measurements, the CODATA recommended 1.380 649 × 10 −23 J/K to be the final fixed value of the Boltzmann constant to be used for the International System of Units. [ 17 ] As a precondition for redefining the Boltzmann constant, there must be one experimental value with a relative uncertainty below 1 ppm , and at least one ...

  4. Select (SQL) - Wikipedia

    en.wikipedia.org/wiki/Select_(SQL)

    The query retrieves all rows from the Book table in which the price column contains a value greater than 100.00. The result is sorted in ascending order by title. The asterisk (*) in the select list indicates that all columns of the Book table should be included in the result set.