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2. 38 (number) - Wikipedia

   en.wikipedia.org/wiki/38_(number)

   38 is the sum of the squares of the first three primes. 37 and 38 are the first pair of consecutive positive integers not divisible by any of their digits. 38 is the largest even number which cannot be written as the sum of two odd composite numbers. The sum of each row of the only non-trivial (order 3) magic hexagon is 38. [4]

3. Template:Math - Wikipedia

   en.wikipedia.org/wiki/Template:Math

   The math template formats mathematical formulas generated using HTML or wiki markup. (It does not accept the AMS-LaTeX markup that <math> does.) The template uses the texhtml class by default for inline text style formulas, which aims to match the size of the serif font with the surrounding sans-serif font (see below).

4. Skip counting - Wikipedia

   en.wikipedia.org/wiki/Skip_counting

   In skip counting by twos, a person can count to 10 by only naming every other even number: 2, 4, 6, 8, 10. [1] Combining the base (two, in this example) with the number of groups (five, in this example) produces the standard multiplication equation: two multiplied by five equals ten.

5. Elementary algebra - Wikipedia

   en.wikipedia.org/wiki/Elementary_algebra

   A linear equation with two variables has many (i.e. an infinite number of) solutions. [38] For example: Problem in words: A father is 22 years older than his son. How old are they? Equivalent equation: = + where y is the father's age, x is the son's age. That cannot be worked out by itself.

6. 10 Hard Math Problems That Even the Smartest People in the ...

   www.aol.com/lifestyle/10-hard-math-problems-even...

   Even numbers are always 0, 2, or 4 more than a multiple of 6, while odd numbers are always 1, 3, or 5 more than a multiple of 6. Well, one of those three possibilities for odd numbers causes an issue.

7. Parity (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Parity_(mathematics)

   The even numbers form an ideal in the ring of integers, [13] but the odd numbers do not—this is clear from the fact that the identity element for addition, zero, is an element of the even numbers only. An integer is even if it is congruent to 0 modulo this ideal, in other words if it is congruent to 0 modulo 2, and odd if it is congruent to 1 ...