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  2. Gray code - Wikipedia

    en.wikipedia.org/wiki/Gray_code

    ); the next digit a pattern of 4 on, 4 off; the i-th least significant bit a pattern of 2 i on 2 i off. The most significant digit is an exception to this: for an n -bit Gray code, the most significant digit follows the pattern 2 n -1 on, 2 n -1 off, which is the same (cyclic) sequence of values as for the second-most significant digit, but ...

  3. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    The Collatz conjecture is: This process will eventually reach the number 1, regardless of which positive integer is chosen initially. That is, for each , there is some with . If the conjecture is false, it can only be because there is some starting number which gives rise to a sequence that does not contain 1.

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    The product of two variables ranging from 90-99 will result in a 4-digit number. The first step is to find the ones-digit and the tens digit. Subtract both variables from 100 which will result in 2 one-digit number. The product of the 2 one-digit numbers will be the last two digits of one's final product.

  5. Round-off error - Wikipedia

    en.wikipedia.org/wiki/Round-off_error

    In computing, a roundoff error, [1] also called rounding error, [2] is the difference between the result produced by a given algorithm using exact arithmetic and the result produced by the same algorithm using finite-precision, rounded arithmetic. [3] Rounding errors are due to inexactness in the representation of real numbers and the ...

  6. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    The major system (also called the phonetic number system, phonetic mnemonic system, or Herigone's mnemonic system) is a mnemonic technique used to help in memorizing numbers. The system works by converting numbers into consonants, then into words by adding vowels. The system works on the principle that images can be remembered more easily than ...

  7. Non-standard positional numeral systems - Wikipedia

    en.wikipedia.org/wiki/Non-standard_positional...

    Non-standard features of this system include: The value of a digit does not depend on its position. Thus, one can easily argue that unary is not a positional system at all. Introducing a radix point in this system will not enable representation of non-integer values. The single numeral represents the value 1, not the value 0 = b − 1.

  8. Lucky number - Wikipedia

    en.wikipedia.org/wiki/Lucky_number

    Lucky number. In number theory, a lucky number is a natural number in a set which is generated by a certain "sieve". This sieve is similar to the Sieve of Eratosthenes that generates the primes, but it eliminates numbers based on their position in the remaining set, instead of their value (or position in the initial set of natural numbers). [1]

  9. Keith number - Wikipedia

    en.wikipedia.org/wiki/Keith_number

    Keith number. In recreational mathematics, a Keith number or repfigit number (short for rep etitive F ibonacci-like d igit) is a natural number in a given number base with digits such that when a sequence is created such that the first terms are the digits of and each subsequent term is the sum of the previous terms, is part of the sequence.