[ https://math.ucr.edu/home/baez/README.html ]( https://math.ucr.edu/home/baez/README.html ) The Crackpot Index John Baez A simple method for rating potentially revolutionary contributions to physics:

https://www.pmsutter.com/appearances/2021/02/10/what-is-dark-matter-dark-energy-ask-a-spaceman You might be interested in this series of articles about the beginning and end of the universe. Kermit

Hi All Here is a new puzzle that I find interesting. I wonder if this has been thought of before. We have a 3x3 square with only 1s. 1 1 1 1 1 1 1 1 1 Now we can perform a move on one of the rows or c

In the attached Excel file I show my experiment of finding factors of a positive integer by choosing a larger number that has many small factors and using the relationships between the divisors of bot

Question and answer from Quora Curtis Lindsay curious Earthling, astronomy hobbyist/enthusiast.Updated Dec 28 Does The Milky Way revolve around another galaxy? It’s a dance, really. Some galaxies are

Hello Marrion. I expect that you will find this interersting. https://www.quora.com/When-I-see-a-star-did-the-photons-entering-my-eye-actually-come-from-that-star -----Original Message----- From: "Quo

>>> “There are efficient algorithms to work out whether r and b have common factors, even for large r and b.” Yes, the Euclidean algorithm in particular comes to my mind!

Recently there was discussion of calculator puzzles, and when the only working operator was division, discussion of repeating decimals. There is an unexpected consequence I want to bring to light. I s

While trying to figure out an inconsistency in a factoring algorithm, I'm working on, I noticed the following interesting sequence 1*7 + 9 = 4^2 2*8 + 9 = 5^2 3*9 + 9 = 6^2 4*10 + 9 = 7^2 5*11 + 9 = 8

My next step toward solving the perfect cuboid is to solve the following system of equations [27] [(z*x-y*w) or (z*w-y*x)] = (j3^2-k3^2)*(j4^2-k4^2) [28] (2*z*y) = (j3*k4-j4*k3) [29] (2*x*w) = (j3*k4+

HI All Here is some peculair properties of the number 12. 1) The 12th composite number is 21 2) 12=3*4 and 12= 3rd prime + 4th prime 2.1) The sum of the 5 first prime numbers is the same as the sum of

The magic square with all square integers resembles the perfect cuboid problem with the exception that the rows and diagonals don't have to add up to another square integer. It'd be interesting the co

The attached Excel file illustrates some patterns of consecutive integers expressed as differences of squares. Does anyone see repeatable patterns in it? Kermit

For anyone interested in some more mathematical/computational challenges, check out https://www.efinancialcareers.co.uk/news/2020/07/how-to-get-a-job-at-jane-street. I enjoy working on many of the puz

Suppose the only operation available was +. A+A = B+B = C+C = D+D = E+E = F+F = G+G = H+H = I+I = J+J = Five of the above would show which digit was 1. Then you would also know which digit was 2. Then

----- Forwarded message ----- From: "Lalit Garg" <laleet63@...> To: "UnsolvedProblems" <unsolvedproblems@...> Cc: Sent: Thu, 12 Sep 2019 at 23:42 Subject: Chellenging problem Dear all .Can anyone find

There is a preprint that claims to have solved the odd perfect number problem. Kindly read the preprint in this link and give comments, criticisms, reviews in the comment section below. https://zenodo

Two Decades ago, Joe Mott, a professor in the math department at Florida State University published a paper that included the following table. Our List of Prime-producing Cubic Polynomials In Table 6

Hi All You have a strange calculator which reads A,B,C,D,E,F,G,H,I,J for the integer values. The puzzle is to find the integer values of A,B,C,D,E,F,G,H,I,J by making calculations with the calculator.

I have an idea several alternate puzzles. So far we have assumed access to the 4 basic operations +, -, * and /. What if the calculator were missing some of these operations? For starters, how many ke