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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    The black numbers are the addends, the green number is the carry, and the blue number is the sum. In the rightmost digit, the addition of 9 and 7 is 16, carrying 1 into the next pair of the digit to the left, making its addition 1 + 5 + 2 = 8. Therefore, 59 + 27 = 86.

  3. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    The top row shows the carry bits used. Starting in the rightmost column, 1 + 1 = 10 2. The 1 is carried to the left, and the 0 is written at the bottom of the rightmost column. The second column from the right is added: 1 + 0 + 1 = 10 2 again; the 1 is carried, and 0 is written at the bottom. The third column: 1 + 1 + 1 = 11 2. This time, a 1 ...

  4. Polite number - Wikipedia

    en.wikipedia.org/wiki/Polite_number

    the even perfect numbers 2 n − 1 (2 n − 1) formed by the product of a Mersenne prime 2 n − 1 with half the nearest power of two, and; the products 2 n − 1 (2 n + 1) of a Fermat prime 2 n + 1 with half the nearest power of two. (sequence A068195 in the OEIS).

  5. Proofs involving the addition of natural numbers - Wikipedia

    en.wikipedia.org/wiki/Proofs_involving_the...

    Next we will prove the base case b = 1, that 1 commutes with everything, i.e. for all natural numbers a, we have a + 1 = 1 + a. We will prove this by induction on a (an induction proof within an induction proof). We have proved that 0 commutes with everything, so in particular, 0 commutes with 1: for a = 0, we have 0 + 1 = 1 + 0

  6. Harshad number - Wikipedia

    en.wikipedia.org/wiki/Harshad_number

    H. G. Grundman extended the Cooper and Kennedy result to show that there are 2b but not 2b + 1 consecutive b-harshad numbers for any base b. [7] [8] This result was strengthened to show that there are infinitely many runs of 2b consecutive b-harshad numbers for b = 2 or 3 by T. Cai [7] and for arbitrary b by Brad Wilson in 1997. [9]

  7. California city sets record for the most days over 100°F ...

    www.aol.com/news/california-city-sets-record...

    When the city hit 106°F on Wednesday, it was the eighth consecutive day that temperatures topped 100°F. By week’s end, Sacramento will have set a third record, topping 100°F for 10 ...