2 (number) 2 (Two; . It is also a Stern prime, a Pell number, the first Fibonacci prime, and a Markov number—appearing in infinitely many solutions to the Markov Diophantine equation involving odd-indexed Pell numbers. It is the third Fibonacci number, and the third and fifth Perrin numbers. Two is the base of the simplest numeral system in which natural numbers can be written concisely, being the length of the number a logarithm of the value of the number (whereas in base 1 the length of the number is the value of the number itself); the binary system is used in computers. For any number x: x+x = 2·x addition to multiplication x·x = x2 multiplication to exponentiation xx = x↑↑2 exponentiation to tetration In general: hyper(x,n,x) = hyper(x,n-1,2) Two also has the unique property that 2+2 = 2·2 = 2²=2↑↑2=2↑↑↑2, and so on, no matter how high the operation is. Two is the only number x such that the sum of the reciprocals of the powers of x equals itself. This comes from the fact that: . and also Football:
3 (number) It is frequently noted by historians of numbers that early counting systems often relied on the three-patterned concept of "One, Two, Many" to describe counting limits. Early peoples had a word to describe the quantities of one and two, but any quantity beyond was simply denoted as "Many". As an extension to this insight, it can also be noted that early counting systems appear to have had limits at the numerals 2, 3, and 4. Three is the largest number still written with as many lines as the number represents. . Many world religions contain triple deities or concepts of trinity, including: The threefold office of Christ is a Christian doctrine that Christ performs the functions of prophet, priest, and king. The Triple Bodhi (ways to understand the end of birth) are Budhu, Pasebudhu, and Mahaarahath. The "Om" symbol, in Devanagari is also written ओ३म् (ō̄m[õːːm]), where ३ is दीर्घ (dirgha, "three times as long") Luck, especially bad luck, is often said to "come in threes".[4]
6 (number) The SI prefix for 10006 is exa (E), and for its reciprocal atto- (a). Since six equals the sum of its proper divisors, six is the smallest perfect number, Granville number, and -perfect number.[1][2] As a perfect number: Six is the only number that is both the sum and the product of three consecutive positive numbers.[4] Unrelated to 6 being a perfect number, a Golomb ruler of length 6 is a "perfect ruler Six is the first discrete biprime (2.3) and the first member of the (2.q) discrete biprime family. 5 and 6 form a Ruth-Aaron pair under either definition. 6 is the largest of the four all-Harshad numbers. There are six basic trigonometric functions. There are six convex regular polytopes in four dimensions. The six exponentials theorem guarantees (given the right conditions on the exponents) the transcendence of at least one of a set of exponentials. All primes above 3 are of the form 6n±1 for n≥1. In bases 10, 15 and 30, 6 is a 1-automorphic number. Hexa is classical Greek for "six".
7 (number) In fact, if one sorts the digits in the number 142857 in ascending order, 124578, it is possible to know from which of the digits the decimal part of the number is going to begin with. The remainder of dividing any number by 7 will give the position in the sequence 124578 that the decimal part of the resulting number will start. For example, 628/7= 89 + 5/7; here 5 is the remainder, and would correspond to number 7 in the ranking of the ascending sequence. So in this case, 628/7 = 89.714285. Graph of the probability distribution of the sum of 2 six-sided dice In quaternary, 7 is the smallest prime with a composite sum of digits. On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most common glyph variation (0, 6 and 9 also have variant glyphs). Most people in Continental Europe[3] and Latin America write 7 with a line in the middle ("7"), sometimes with the top line crooked. 7UP is the name of a popular soft drink. The Seven Arts Productions
9 (number) In the NATO phonetic alphabet, the digit 9 is called "Niner".Five-digit produce PLU codes that begin with 9 are organic. Common terminal digit in psychological pricing Nine Lives cat food; its name is derived from the legend that a cat has nine livesNine Network a.k.a. Channel 9, an Australian free-to-air television stationNine West, a clothing brand [1] Nine (九 pinyin jiǔ) is considered a good number in Chinese culture because it sounds the same as the word "longlasting" (久 pinyin jiǔ)[citation needed].Nine is strongly associated with the Chinese dragon, a symbol of magic and power. The nine bows is a term used in Ancient Egypt to represent the traditional enemies of Egypt The Nine Worthies are nine historical, or semi-legendary figures who, in the Middle Ages, were believed to personify the ideals of chivalry The Japanese consider nine to be unlucky because in Japanese the word for nine sounds similar to the word for "pain" or "distress" (苦, kyū)[citation needed]. The 9 on Yahoo!
10 (number) 10 (ten A collection of ten items (most often ten years) is called a decade.The ordinal adjective is denary.Increasing a quantity by one order of magnitude is most widely understood to mean multiplying the quantity by ten.To reduce something by one-tenth is to decimate. (In ancient Rome, the killing of one in ten soldiers in a cohort was the punishment for cowardice or mutiny; or, one-tenth of the able-bodied men in a village as a form of retribution, thus causing a labor shortage and threat of starvation in agrarian societies.)With ten being the base of the decimal system, a scale of 1 to 10 is often used to rank things, as a smaller version of a 1-to-100 scale (as is used in percentages and wine-tasting). Hence, something that scores perfectly is "a perfect ten". Ten is the second discrete semiprime (2.5) and the second member of the (2.q) discrete semiprime family. Ten is a semi-meandric number. A polygon with ten sides is a decagon, and 10 is a decagonal number. Properties:
11 (number) 11 (eleven In English, it is the smallest positive integer requiring three syllables and the largest prime number with a single-morpheme name. Its etymology originates from a Germanic compound ainlif meaning "one left".[1]). If a number is divisible by 11, reversing its digits will result in another multiple of 11. As 11 is the smallest factor of the first 11 terms of the Euclid–Mullin sequence, it is the 12th term. An 11-sided polygon is called a hendecagon or undecagon. In both base 6 and base 8, the smallest prime with a composite sum of digits is 11. Any number b+1 is written as "11b" in base b, so 11 is trivially a palindrome in base 10. In base 10, there is a simple test to determine if an integer is divisible by 11: take every digit of the number located in odd position and add them up, then take the remaining digits and add them up. An easy way of multiplying numbers by 11 in base 10 is: If the number has: In base 10, 11 is the smallest integer that is not a Nivenmorphic number.
12 (number) 12 (twelve A group of twelve things is called a duodecad. The ordinal adjective is duodecimal, twelfth. The adjective referring to a group consisting of twelve things is duodecuple. As shown below, the number twelve is frequently cited in the Abrahamic religions and is also central to the Western calendar and units of time. Twelve is a sublime number, a number that has a perfect number of divisors, and the sum of its divisors is also a perfect number. If an odd perfect number is of the form 12k + 1, it has at least twelve distinct prime factors. Twelve is a superfactorial, being the product of the first three factorials. Twelve is the ninth Perrin number, preceded in the sequence by 5, 7, 10, and also appears in the Padovan sequence, preceded by the terms 5, 7, 9 (it is the sum of the first two of these). There are twelve Jacobian elliptic functions and twelve cubic distance-transitive graphs. There are 12 Latin squares of size 3×3. There are twelve "Jyotirlingas" in Hindu Shaivism.