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2. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

3. Collatz conjecture - Wikipedia

   en.wikipedia.org/wiki/Collatz_conjecture

   The values of c (or better 3 c) and d can be precalculated for all possible k-bit numbers b, where d(b, k) is the result of applying the f function k times to b, and c(b, k) is the number of odd numbers encountered on the way. [30]

4. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   A cube has all multiplicities divisible by 3 (it is of the form a 3 for some a). The first: 1, 8, 27, 64, 125, 216, 343, 512, 729, 1000, 1331, 1728 (sequence A000578 in the OEIS ). A perfect power has a common divisor m > 1 for all multiplicities (it is of the form a m for some a > 1 and m > 1).

5. All-time Olympic Games medal table - Wikipedia

   en.wikipedia.org/wiki/All-time_Olympic_Games...

   The table does not count revoked medals (e.g., due to doping). A total of 162 current and historical NOCs have earned at least one medal. Medal totals in this table are current through the 2024 Summer Olympics , and all changes in medal standings due to doping cases and medal redistributions up to 11 August 2024 are taken into account.

6. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   If the hundreds digit is odd, the number obtained by the last two digits must be 4 times an odd number. 352: 52 = 4 x 13. Add the last digit to twice the rest. The result must be divisible by 8. 56: (5 × 2) + 6 = 16. The last three digits are divisible by 8. [2][3] 34,152: Examine divisibility of just 152: 19 × 8.

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