Determining composite numbers by using geometric progression.
99890
Primes with digits only 1
65492
Basic Geometric Series
120684
Calculating the number of possible paths through some squares
76892
Factoring inequalities on Double Summation (Donald Knuth's Concrete Mathematics)
111042
A geometry problem from high school Olympiad selection round
134539
Euclidean and induction with prime numbers
149241
What is the maximum number of consecutive composite numbers possible?
110723
Catalan numbers and triangulation
134352
The number of possible factorizations of a positive integer.
50580
Suppressing reduction in fraction box size in multi-level fractions
16168
Intuitive Bernoulli numbers
22274
Partitioning a natural number $n$ in order to get the maximum product sequence of its addends
121469
Proof of observations on natural numbers being expressed as differences of squares.
85204
Winding numbers are continuous: The proof was too easy
70886
Hypothesis testing with the geometric distribution for dummies
130851
Squaring the plane, with consecutive integer squares. And a related arrangement
40635
Finding Maximum value of consecutive positive integers with constraints