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dingn.com Training and recall of 1 digit to 4 digits numbers, vocabulary cards and a deck of shuffled playing cards with personalized favorite word selection for each number. LOC Serendipity A quiz to learn the sound/number correspondences of the Major system by rote. Also available are quizzes to learn the top 100 adjective and noun ...
A composite number n is a strong pseudoprime to at most one quarter of all bases below n; [3] [4] thus, there are no "strong Carmichael numbers", numbers that are strong pseudoprimes to all bases. Thus given a random base, the probability that a number is a strong pseudoprime to that base is less than 1/4, forming the basis of the widely used ...
Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89: Largest base for which all left-truncatable primes are known. 90: Nonagesimal: Related to Goormaghtigh conjecture for the generalized repunit numbers (111 in base 90 = 1111111111111 in base 2). 95: Number of printable ASCII characters ...
An atom (or ion) whose oxidation number increases in a redox reaction is said to be oxidized (and is called a reducing agent). It is accomplished by loss of one or more electrons. The atom whose oxidation number decreases gains (receives) one or more electrons and is said to be reduced. This relation can be remembered by the following mnemonics.
Negative base numeral system (base −3) Quaternary numeral system (base 4) Quater-imaginary base (base 2 √ −1) Quinary numeral system (base 5) Pentadic numerals – Runic notation for presenting numbers; Senary numeral system (base 6) Septenary numeral system (base 7) Octal numeral system (base 8) Nonary (novenary) numeral system (base 9 ...
There are 4842 strong pseudoprimes base 2 and 2163 Carmichael numbers below this limit (see Table 1 of [5]). Starting at 17·257, the product of consecutive Fermat numbers is a base-2 pseudoprime, and so are all Fermat composites and Mersenne composites.
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There is also the major system, which connects sounds to numbers. [3] [4] The major system is more complicated to learn than simple rhymes or alphabetic pegs, because it associates numbers 0-9 with a specific letter or sound, then larger numbers can combine to create words out of the sounds. [3] It is limitless in the number of pegs it can produce.