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  2. Math Arrow - Wikipedia

    en.wikipedia.org/wiki/Math_Arrow

    Unlike a number line, which extends horizontally and infinitely, the Math Arrow displays the whole numbers from 0 to 100 in a pair of parallel zigzag lines. [2] The numbers on the left-hand zigzag run from 0 at the bottom to 50 at the top; on the right-hand zigzag they run from 50 at the top to 100 at the bottom (the number 50 appears twice, at the top of both zigzags).

  3. Interprime - Wikipedia

    en.wikipedia.org/wiki/Interprime

    In mathematics, an interprime is the average of two consecutive odd primes. [1] For example, 9 is an interprime because it is the average of 7 and 11. The first interprimes are:

  4. Sieve of Eratosthenes - Wikipedia

    en.wikipedia.org/wiki/Sieve_of_Eratosthenes

    The earliest known reference to the sieve (Ancient Greek: κόσκινον Ἐρατοσθένους, kóskinon Eratosthénous) is in Nicomachus of Gerasa's Introduction to Arithmetic, [3] an early 2nd century CE book which attributes it to Eratosthenes of Cyrene, a 3rd century BCE Greek mathematician, though describing the sieving by odd ...

  5. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    The machine will perform the following three steps on any odd number until only one 1 remains: Append 1 to the (right) end of the number in binary (giving 2n + 1); Add this to the original number by binary addition (giving 2n + 1 + n = 3n + 1); Remove all trailing 0 s (that is, repeatedly divide by 2 until the result is odd).

  6. Parity (mathematics) - Wikipedia

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

    Even and odd numbers have opposite parities, e.g., 22 (even number) and 13 (odd number) have opposite parities. In particular, the parity of zero is even. [2] Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That ...

  7. Arrow diagramming method - Wikipedia

    en.wikipedia.org/wiki/Arrow_Diagramming_Method

    In addition, the precedence diagram method (PDM), or activity-on-node (AON), is often favored over ADM. [2] ADM network drawing technique the start and end of each node or event is connected to an arrow. The start of the arrow comes out of a node while the tip of the arrow goes into a node.