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d is the number of positive divisors of n, including 1 and n itself; σ is the sum of the positive divisors of n, including 1 and n itself; s is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n; a deficient number is greater than the sum of its proper divisors; that is, s(n) < n
111 is or the second repunit in decimal, [8] a number like 11, 111, or 1111 that consists of repeated units, or ones. 111 equals 3 × 37, therefore all triplets (numbers like 222 or 777) in base ten are repdigits of the form . As a repunit, it also follows that 111 is a palindromic number.
Any positive multiple of the repunit R n (b) contains at least n nonzero digits in base-b. Any number x is a two-digit repunit in base x − 1. The only known numbers that are repunits with at least 3 digits in more than one base simultaneously are 31 (111 in base-5, 11111 in base-2) and 8191 (111 in base-90, 1111111111111 in base-2).
A positive integer that can be written as the sum of two or more consecutive positive integers. A138591: Erdős–Nicolas numbers: 24, 2016, 8190, 42336, 45864, 392448, 714240, 1571328, ... A number n such that there exists another number m and , =. A194472: Solution to Stepping Stone Puzzle
Equivalently, a prime number is a positive integer that has exactly two positive factors: 1 and itself. Any positive divisor of n {\displaystyle n} is a product of prime divisors of n {\displaystyle n} raised to some power.
Here's what's to know about the angel number 111. Do you find yourself spotting 111, 11:11 or any series of repeating digits? That might not be a coincidence. Here's what's to know about the angel ...
To test the divisibility of a number by a power of 2 or a power of 5 (2 n or 5 n, in which n is a positive integer), one only need to look at the last n digits of that number. To test divisibility by any number expressed as the product of prime factors p 1 n p 2 m p 3 q {\displaystyle p_{1}^{n}p_{2}^{m}p_{3}^{q}} , we can separately test for ...
In the early hours of New Year’s Day, Elon Musk lobbed a series of angry posts and allegations towards British Prime Minister Keir Starmer – engulfing his government in a very public fight ...