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7] = + = + = + = + = (+) (+) + = = + = + ( + ()) ( ()) An infinite series of any rational function of can be reduced to a finite series of polygamma ...
[1] [2] All functions use floating-point numbers in one manner or another. Different C standards provide different, albeit backwards-compatible, sets of functions. Most of these functions are also available in the C++ standard library, though in different headers (the C headers are included as well, but only as a deprecated compatibility feature).
The sum of the reciprocals of the numbers in any sum-free sequence is less than 2.8570 . The sum of the reciprocals of the heptagonal numbers converges to a known value that is not only irrational but also transcendental , and for which there exists a complicated formula .
If the inputs are all non-negative, then the condition number is 1. Note that the 1 − ε log 2 n {\displaystyle 1-\varepsilon \log _{2}n} denominator is effectively 1 in practice, since ε log 2 n {\displaystyle \varepsilon \log _{2}n} is much smaller than 1 until n becomes of order 2 1/ε , which is roughly 10 10 15 in double precision.
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Let A be the sum of the negative values and B the sum of the positive values; the number of different possible sums is at most B-A, so the total runtime is in (()). For example, if all input values are positive and bounded by some constant C , then B is at most N C , so the time required is O ( N 2 C ) {\displaystyle O(N^{2}C)} .
A number which is a harshad number in every number base is called an all-harshad number, or an all-Niven number. There are only four all-harshad numbers: 1 , 2 , 4 , and 6 . The number 12 is a harshad number in all bases except octal .
What do we get if we sum all the natural numbers? response to comments about video by Tony Padilla Related article from New York Times Why –1/12 is a gold nugget follow-up Numberphile video with Edward Frenkel