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Euler ascertained that 2 31 − 1 = 2147483647 is a prime number; and this is the greatest at present known to be such, and, consequently, the last of the above perfect numbers [i.e., 2 30 (2 31 − 1)], which depends upon this, is the greatest perfect number known at present, and probably the greatest that ever will be discovered; for as they ...
In mathematics, a square-free integer (or squarefree integer) is an integer which is divisible by no square number other than 1. That is, its prime factorization has exactly one factor for each prime that appears in it. For example, 10 = 2 ⋅ 5 is square-free, but 18 = 2 ⋅ 3 ⋅ 3 is not, because 18 is divisible by 9 = 3 2. The smallest ...
To qualify for free shipping, non-Prime members typically have to purchase an order totaling at least $25. On Monday, the e-commerce giant said it has raised that minimum to $35.
In 2011, Free Shipping Day became a billion-dollar shopping holiday with $1.072 billion in sales, [5] followed by $1.01 billion during Free Shipping Day 2012. [ 6 ] In 2013, Knowles changed the format of Free Shipping Day to only include merchants that could waive all minimum order requirements and guarantee delivery by Christmas Eve. [ 7 ]
(And by the way, those without Prime still get free shipping on orders of $35 or more.) The reviews quoted above reflect the most recent versions at the time of publication. Looking for more great ...
(And by the way, those without Prime still get free shipping on orders of $35 or more.) The reviews quoted above reflect the most recent versions at the time of publication. Related Articles
The square of the absolute value of a complex number is called its absolute square, squared modulus, or squared magnitude. [ 1 ] [ better source needed ] It is the product of the complex number with its complex conjugate , and equals the sum of the squares of the real and imaginary parts of the complex number.
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