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The first: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 (sequence A005408 in the OEIS). All integers are either even or odd. All integers are either even or odd. A square has even multiplicity for all prime factors (it is of the form a 2 for some a ).
Mathematics: 2,520 (5×7×8×9 or 2 3 ×3 2 ×5×7) is the least common multiple of every positive integer under (and including) 10. Terrorism: 2,996 persons (including 19 terrorists) died in the terrorist attacks of September 11, 2001. Biology: the DNA of the simplest viruses has 3,000 base pairs. [11]
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
3.63 m – the record wingspan for living birds (a wandering albatross) 3.7 m – leg span of a Japanese spider crab; 3.7 m – length of a southern elephant seal, the largest living pinniped; 5 m – length of an elephant; 5.2 m – height of a giraffe [122] 5.5 m – height of a Baluchitherium, the largest land mammal ever lived
For example, 15 is a composite number because 15 = 3 · 5, but 7 is a prime number because it cannot be decomposed in this way. If one of the factors is composite, it can in turn be written as a product of smaller factors, for example 60 = 3 · 20 = 3 · (5 · 4) .
7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
The elements 2 and 1 + √ −3 are two maximal common divisors (that is, any common divisor which is a multiple of 2 is associated to 2, the same holds for 1 + √ −3, but they are not associated, so there is no greatest common divisor of a and b.
The 10 to 1 ratio was an estimate made in 1972; current estimates put the ratio at either 3 to 1 or 1.3 to 1. [300] The total length of capillaries in the human body is not 100,000 km. That figure comes from a 1929 book by August Krogh, who used an unrealistically large model person and an inaccurately high density of capillaries.