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2. Achilles number - Wikipedia

   en.wikipedia.org/wiki/Achilles_number

   As an example, 108 is a powerful number. Its prime factorization is 2 2 · 3 3, and thus its prime factors are 2 and 3. Both 2 2 = 4 and 3 2 = 9 are divisors of 108. However, 108 cannot be represented as m k, where m and k are positive integers greater than 1, so 108 is an Achilles number. The integer 360 is not an Achilles number because it is ...

3. Powerful number - Wikipedia

   en.wikipedia.org/wiki/Powerful_number

   A powerful number is a positive integer m such that for every prime number p dividing m, p 2 also divides m.Equivalently, a powerful number is the product of a square and a cube, that is, a number m of the form m = a 2 b 3, where a and b are positive integers.

4. List of mathematical constants - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_constants

   A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

5. National Achievement Test - Wikipedia

   en.wikipedia.org/wiki/National_Achievement_Test

   The test is a system-based assessment designed to gauge learning outcomes across target levels in identified periods of basic education. Empirical information on the achievement level of pupils/students serve as a guide for policy makers, administrators, curriculum planners, principles, and teachers, along with analysis on the performance of regions, divisions, schools, and other variables ...

6. Numeracy - Wikipedia

   en.wikipedia.org/wiki/Numeracy

   They roll three dice, construct an equation from the numbers to produce a new number, then cover that number on the board, trying to get four in a row. Number bingo improves math skills. LPB Laos. Numeracy is the ability to understand, reason with, and apply simple numerical concepts. [1]

7. Perfect number - Wikipedia

   en.wikipedia.org/wiki/Perfect_number

   In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28. The first four perfect ...