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Is every natural number the truncation of a prime?
number-theory
elementary-number-theory
reference-request
prime-numbers
recreational-mathematics
How to estimate the number of articles on Wikipedia using the "random article" function?
probability
recreational-mathematics
Is there a list of the number of sets of consecutive integers that sum to n?
algorithms
summation
recreational-mathematics
Five Similar Triangles from 4-5-6
geometry
triangles
recreational-mathematics
puzzle
Arranging numbers from $1$ to $n^2$ in a $n\times n$ board
combinatorics
discrete-mathematics
contest-math
recreational-mathematics
puzzle
A card game with no decisions
probability
combinatorics
recreational-mathematics
card-games
Defining $|x|=-1$
definition
recreational-mathematics
absolute-value
Generating numbers by repeated doubling and digit reversal
number-theory
divisibility
recreational-mathematics
decimal-expansion
Functional Equation $f(x+y)-f(x-y)=2f'(x)f'(y)$
functions
recreational-mathematics
functional-equations
Does every number not ending with zero have a multiple without zero digits at all?
elementary-number-theory
recreational-mathematics
decimal-expansion
Relationship between primes and practical numbers
number-theory
prime-numbers
recreational-mathematics
pattern-recognition
experimental-mathematics
Can we arrange $\{1,...,16\}$ in $4\times 4$-grid so {products of rows} = {products of columns}?
permutations
contest-math
recreational-mathematics
Identifying 2 poisoned wines out of 2^n wines
recreational-mathematics
puzzle
Cyclic sums -- How do you use them?
recreational-mathematics
contest-math
Lights out game on hexagonal grid
linear-algebra
combinatorics
discrete-mathematics
recreational-mathematics
The number of prime years in a lifetime
number-theory
prime-numbers
recreational-mathematics
Behaviour of the series $\exp_p(x)=\sum_{k=0}^{\infty}\frac{x^k}{(k!)^p}$ depending on $p\approx 2$?
sequences-and-series
special-functions
recreational-mathematics
Optimal stopping of a Poisson Process with a risky reward
recreational-mathematics
stopping-times
poisson-process
optimal-control
dynamic-programming
Can exist an even number greater than $36$ with more even divisors than $36$, all of them being a prime$-1$?
elementary-number-theory
prime-numbers
divisibility
recreational-mathematics
Prove $\sum_{n=1}^\infty(e-\sum_{k=0}^n\frac1{k!})=1$
summation
recreational-mathematics
exponential-function
factorial
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