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168 is the fourth Dedekind number, [1] and one of sixty-five idoneal numbers. [2] It is one less than a square (13 2), equal to the product of the first two perfect numbers [3] There are 168 primes less than 1000. [a]
Chinese numerology. Some numbers are believed by some to be auspicious or lucky (吉利, pinyin: jílì; Cantonese Yale: gātleih) or inauspicious or unlucky (不吉, pinyin: bùjí; Cantonese Yale: bātgāt) based on the Chinese word that the number sounds similar to. The numbers 6 and 8 are widely considered to be lucky, while 4 is considered ...
Numerology (known before the 20th century as arithmancy) is the belief in an occult, divine or mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value, via an alphanumeric system, of the letters in words and names. When numerology is applied to a person's name, it is a form of onomancy.
In mathematics. 169 is an odd number, a composite number, and a deficient number. 169 is a square number: 13 × 13 = 169, and if each number is reversed the equation is still true: 31 × 31 = 961. 144 shares this property: 12 × 12 = 144, 21 × 21 = 441. 169 is one of the few squares to also be a centered hexagonal number. [1]
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
295 or −86 or −858. Year 168 (CLXVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Apronianus and Paullus (or, less frequently, year 921 Ab urbe condita). The denomination 168 for this year has been used since the early medieval ...
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108 is: an abundant number. a semiperfect number. a tetranacci number. [1] the hyperfactorial of 3 since it is of the form. 1 1 ⋅ 2 2 ⋅ 3 3 {\displaystyle 1^ {1}\cdot 2^ {2}\cdot 3^ {3}} . divisible by the value of its φ function, which is 36.