Weird number - Wikipedia
In number theory, a weird number is a natural number that is abundant but not semiperfect. [1] [2] In other words, the sum of the proper divisors (divisors including 1 but not itself) of the number is greater than the number, but no subset of those divisors sums to the number itself.
These Are the Most Bizarre Numbers in the Universe
May 23, 2023 · What is the most bizarre real number that you can imagine? Probably many people think of an irrational number such as pi (π) or Euler’s number. And indeed, such values can be considered...
Pi Day: 12 numbers that are cooler than pi - Live Science
Mar 14, 2022 · To celebrate Pi Day, we asked several mathematicians to tell us their favorite non-pi numbers. Here are some of their answers.
Almanac of Interesting Numbers - Mathigon
smallest weird number: an abundant number which is not the sum of any subset of its divisors. a Pell number and a generalised heptagonal number
70 is weird - YouTube
Apr 8, 2024 · In math and number theory there are many sequences of numbers and one of the most interesting ones is the weird numbers! In this video, we examine the motivation behind them, especially...
Why 5, 8 and 24 Are the Strangest Numbers in the Universe
Why 5, 8 and 24 Are the Strangest Numbers in the Universe. John Baez expounds on what makes the numbers 5, 8 and 24 so special. By Michael Moyer.
r/WeirdNumbers - Reddit
r/WeirdNumbers: A collection of weird, obscure and fun phone numbers to call.
Weird Number -- from Wolfram MathWorld
A "weird number" is a number that is abundant (i.e., the sum of proper divisors is greater than the number) without being pseudoperfect (i.e., no subset of the proper divisors sums to the number itself).
Weird numbers - OeisWiki - The On-Line Encyclopedia of Integer ...
Jul 19, 2016 · A weird number is an abundant number that is not pseudoperfect (semiperfect). For example, the proper divisors of 70 (the first weird number) are 1, 2, 5, 7, 10, 14, 35, and these add up to 74, which is 4 more than 70, meaning that 70 is abundant.
Odd Weird Numbers - American Mathematical Society
Aug 29, 2013 · Weird numbers are natural numbers that are abundant but not semiperfect. For example, 70 is the lowest weird number, because its set of proper divisors {1,2,5,7,10,14,35} sum to 74, but no subset of its set of proper divisors sum to the number 70, and 70 is the smallest number to meet such conditions.