Euclid proved that 2 p−1 (2 p − 1) is an even perfect number whenever 2 p − 1 is prime (Euclid, Prop. IX.36). For example, the first four perfect numbers are ...

How many numbers below $100$ can be expressed as a difference of two perfect squares in only one way? ... If we don't allow $0^2$ as a perfect square, ...

A number is a perfect square if given number is equal to the square of some natural number.

How many perfect square are between 1 ... The number of perfect square numbers between 50 and 1000 are? ... How many numbers between 10 and 20 are perfect squares?

All perfect squares end in 1, 4, 5, 6, 9 or 00 (i.e. Even number of zeros). Therefore, a number that ends in 2, 3, 7 or 8 is not a perfect square.

The world population is the total number of living humans on Earth. As of 2013, it is estimated at 7.182 billion by the United States Census Bureau (USCB). The USCB ...

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Population, 2013 estimate : 316,128,839: Population, ... Total number of firms, 2007 : 27,092,908: ... Land area in square miles, 2010 :

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Bill's technique used the fact the sum of a sequence of odd numbers is always the next perfect square (For ... with beautifully rounded corners ...

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Historical Tables . Historical Tables provides data on budget receipts, outlays, surpluses or deficits, Federal debt, and Federal employment over an extended time ...

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Electricity lights up our homes, cooks our food, ... But no matter how many particles an atom has, the number of electrons usually needs to be the same as the number ...

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