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2. 68 (number) - Wikipedia

   en.wikipedia.org/wiki/68_(number)

   68 is a composite number; a square-prime, of the form (p 2, q) where q is a higher prime. It is the eighth of this form and the sixth of the form (2 2.q). 68 is a Perrin number. [1] It has an aliquot sum of 58 within an aliquot sequence of two composite numbers (68, 58,32,31,1,0) to the Prime in the 31-aliquot tree.

3. Collatz conjecture - Wikipedia

   en.wikipedia.org/wiki/Collatz_conjecture

   The number is taken to be 'odd' or 'even' according to whether its numerator is odd or even. Then the formula for the map is exactly the same as when the domain is the integers: an 'even' such rational is divided by 2; an 'odd' such rational is multiplied by 3 and then 1 is added.

4. Mathematical puzzle - Wikipedia

   en.wikipedia.org/wiki/Mathematical_puzzle

   Conway's Game of Life and fractals, as two examples, may also be considered mathematical puzzles even though the solver interacts with them only at the beginning by providing a set of initial conditions. After these conditions are set, the rules of the puzzle determine all subsequent changes and moves.

5. Wason selection task - Wikipedia

   en.wikipedia.org/wiki/Wason_selection_task

   An example of the puzzle is: You are shown a set of four cards placed on a table, each of which has a number on one side and a color on the other. The visible faces of the cards show 3, 8, blue and red. Which card(s) must you turn over in order to test that if a card shows an even number on one face, then its opposite face is blue?

6. Riddle - Wikipedia

   en.wikipedia.org/wiki/Riddle

   A riddle is a statement, question or phrase having a double or veiled meaning, put forth as a puzzle to be solved. Riddles are of two types: enigmas, which are problems generally expressed in metaphorical or allegorical language that require ingenuity and careful thinking for their solution, and conundra, which are questions relying for their effects on punning in either the question or the ...

7. 45 Best Bible Riddles You’ll Have Fun Solving

   www.aol.com/45-best-bible-riddles-ll-155811658.html

   These funny Bible riddles have a mix of everything—including easy riddles, riddles for kids, tricky riddles, and even a few math riddles thrown into the mix. (Yes, even Jesus had to do math!) So ...

8. 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 ...

9. Singly and doubly even - Wikipedia

   en.wikipedia.org/wiki/Singly_and_doubly_even

   A doubly even number is an integer that is divisible more than once by 2; it is even and its quotient by 2 is also even. The separate consideration of oddly and evenly even numbers is useful in many parts of mathematics, especially in number theory, combinatorics , coding theory (see even codes ), among others.