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  2. Square number - Wikipedia

    en.wikipedia.org/wiki/Square_number

    if the last digit of a number is 4 or 6, its square ends in an odd digit followed by a 6; and; if the last digit of a number is 5, its square ends in 25. In base 12, a square number can end only with square digits (like in base 12, a prime number can end only with prime digits or 1), that is, 0, 1, 4 or 9, as follows:

  3. Exponentiation by squaring - Wikipedia

    en.wikipedia.org/wiki/Exponentiation_by_squaring

    For n greater than about 4 this is computationally more efficient than naively multiplying the base with itself repeatedly. Each squaring results in approximately double the number of digits of the previous, and so, if multiplication of two d -digit numbers is implemented in O( d k ) operations for some fixed k , then the complexity of ...

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Here, 29 is greater than 1 cubed, greater than 2 cubed, greater than 3 cubed, but not greater than 4 cubed. The greatest cube it is greater than is 3, so the first digit of the two-digit cube must be 3. Therefore, the cube root of 29791 is 31. Another example: Find the cube root of 456533. The cube root ends in 7.

  5. Square (algebra) - Wikipedia

    en.wikipedia.org/wiki/Square_(algebra)

    On the negative numbers, numbers with greater absolute value have greater squares, so the square is a monotonically decreasing function on (−∞,0]. Hence, zero is the (global) minimum of the square function. The square x 2 of a number x is less than x (that is x 2 < x) if and only if 0 < x < 1, that is, if x belongs to the open interval (0,1).

  6. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Repeat the procedure, since the number is greater than 7. Now, 4 becomes 5, which must be added to 6. That is 11. Repeat the procedure one more time: 1 becomes 3, which is added to the second digit (1): 3 + 1 = 4. Now we have a number smaller than 7, and this number (4) is the remainder of dividing 186/7.

  7. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a ...

  8. California vote count is slow, that doesn't mean it's 'rigged ...

    www.aol.com/california-vote-count-slow-doesnt...

    The claim: California counting ballots two weeks after Election Day is evidence it was ‘rigged’ A Nov. 19 Instagram post (direct link, archive link) claims one state’s lengthy vote-counting ...

  9. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    Every even perfect number ends in 6 or 28, base ten; and, with the only exception of 6, ends in 1 in base 9. [55] [56] Therefore, in particular the digital root of every even perfect number other than 6 is 1. The only square-free perfect number is 6. [57]