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2. Multiply perfect number - Wikipedia

   en.wikipedia.org/wiki/Multiply_perfect_number

   In mathematics, a multiply perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number. For a given natural number k , a number n is called k -perfect (or k -fold perfect) if the sum of all positive divisors of n (the divisor function , σ ( n )) is equal to kn ; a number is thus perfect if and ...

3. List of Mersenne primes and perfect numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_Mersenne_primes...

   Perfect numbers are natural numbers that equal the sum of their positive proper divisors, which are divisors excluding the number itself. So, 6 is a perfect number because the proper divisors of 6 are 1, 2, and 3, and 1 + 2 + 3 = 6. [2] [4] Euclid proved c. 300 BCE that every prime expressed as M p = 2 p − 1 has a corresponding perfect number ...

4. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   The predecessor of a natural number (excluding zero) is the previous natural number and is the result of subtracting one from that number. For example, the successor of zero is one, and the predecessor of eleven is ten ( 0 + 1 = 1 {\displaystyle 0+1=1} and 11 − 1 = 10 {\displaystyle 11-1=10} ).

5. Chisanbop - Wikipedia

   en.wikipedia.org/wiki/Chisanbop

   With the chisanbop method it is possible to represent all numbers from 0 to 99 with the hands, rather than the usual 0 to 10, and to perform the addition, subtraction, multiplication and division of numbers. [4] The system has been described as being easier to use than a physical abacus for students with visual impairments. [5]

6. Should You Stop Drinking Coffee Every Day? Experts Weigh In - AOL

   www.aol.com/stop-drinking-coffee-every-day...

   There are a handful of things most of us do every day upon waking up: brush our teeth, scroll on our phones, enjoy a cup of coffee.For many, that cup of coffee is a non-negotiable, whether you ...

7. 6 Most Affordable Travel Destinations To Visit in January - AOL

   www.aol.com/6-most-affordable-travel...

   According to the winter edition of the Portrait of American Travelers report from MMGY, almost eight in 10 American adults planned to take a vacation over the next year, a 7% increase from the ...