Newbetuts

What is the algorithm to generate the cards in the game "Dobble" ( known as "Spot it" in the USA )?h

Closed-form for $B=\lim_{n\to\infty}\sum_{a_1=1}^{\infty}\frac{1}{a_1^2}\sum_{a_2=1}^{a_1}\frac{1}{a_2^2}\cdots\sum_{a_n=1}^{a_{n-1}}\frac{1}{a_n^2}$?

Quadratic inequality puzzle: Prove$ |cx^2 + bx + a| ≤ 2$ given $|ax^2+bx+c| ≤ 1$

A simple irrational number with the same first 11,667,755 digits as $\frac{2}{3}$

Stopping the Coronavirus puzzle [closed]

Intuitive proof of $\sum_{k=1}^{n} \binom{n}{k} k^{k-1} (n-k)^{n-k} = n^n$

How many bananas can a camel deliver without eating them all?

How many trees in a forest?

What's the smallest number that we can multiply with a given one to get the result only zeros and ones?

How, if at all, does pure mathematics benefit from $2^{74207281}-1$ being prime?

Can not derive $\cos (x + y)$

What are some easy but beautiful patterns in Pascal's Triangle? [closed]

Numbers whose decimal digits are the coefficients of its continued fraction form

Just using $+$ ,$-$, $\times$ using any given n-1 integers, can we make a number divisible by n? (NO bracket allowed!!)

New posts in recreational-mathematics

Drawing balls from urn with conditional replacement [closed]

Golden Rectangle into Golden Rectangles

What is the most unfair set of three nontransitive dice?

Fibonacci numbers and the nontrivial zeros of the Riemann zeta function

Who has the upper hand in a generalized game of Risk?

So close yet so far Finding $\int \frac {\sec x \tan x}{3x+5} dx$

What is the algorithm to generate the cards in the game "Dobble" ( known as "Spot it" in the USA )?h

Closed-form for $B=\lim_{n\to\infty}\sum_{a_1=1}^{\infty}\frac{1}{a_1^2}\sum_{a_2=1}^{a_1}\frac{1}{a_2^2}\cdots\sum_{a_n=1}^{a_{n-1}}\frac{1}{a_n^2}$?

Quadratic inequality puzzle: Prove$ |cx^2 + bx + a| ≤ 2$ given $|ax^2+bx+c| ≤ 1$

A simple irrational number with the same first 11,667,755 digits as $\frac{2}{3}$

Stopping the Coronavirus puzzle [closed]

Intuitive proof of $\sum_{k=1}^{n} \binom{n}{k} k^{k-1} (n-k)^{n-k} = n^n$

How many bananas can a camel deliver without eating them all?

How many trees in a forest?

What's the smallest number that we can multiply with a given one to get the result only zeros and ones?

How, if at all, does pure mathematics benefit from $2^{74207281}-1$ being prime?

Can not derive $\cos (x + y)$

What are some easy but beautiful patterns in Pascal's Triangle? [closed]

Numbers whose decimal digits are the coefficients of its continued fraction form

Just using $+$ ,$-$, $\times$ using any given n-1 integers, can we make a number divisible by n? (NO bracket allowed!!)