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The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is divisible by 4, the original number is divisible by 4; [2] [3] this is because 100 is divisible by 4 and so adding hundreds, thousands, etc. is simply adding another number that is divisible by 4. If any number ends in a two digit number that ...
Plot of the number of divisors of integers from 1 to 1000. Highly composite numbers are in bold and superior highly composite numbers are starred. ... 56 28 perfect ...
Prime numbers have exactly 2 divisors, and highly composite numbers are in bold. 7 is a divisor of 42 because =, so we can say It can also be said that 42 is divisible by 7, 42 is a multiple of 7, 7 divides 42, or 7 is a factor of 42. The non-trivial divisors of 6 are 2, −2, 3, −3.
A multiple of a number is the product of that number and an integer. For example, 10 is a multiple of 5 because 5 × 2 = 10, so 10 is divisible by 5 and 2. Because 10 is the smallest positive integer that is divisible by both 5 and 2, it is the least common multiple of 5 and 2.
A refactorable number or tau number is an integer n that is ... 18, 24, 36, 40, 56, 60 ... 2 and 9, 3 and 6) and is divisible by 6. There are infinitely many ...
F kn is divisible by F n, so, apart from F 4 = 3, ... [55] and no ratio of two Fibonacci numbers can be perfect. [56] Prime divisors. With the exceptions of 1, ...
A palindromic number ... All palindromic numbers with an even number of digits are divisible by 11. [1] ... 56 324 583 3383 6093 + +
The prime numbers are precisely the atoms of the division lattice, namely those natural numbers divisible only by themselves and 1. [ 2 ] For any square-free number n , its divisors form a Boolean algebra that is a sublattice of the division lattice.