Summing the even numbers in any row of pascal's triangle.
136580
Proving $\sum_{k=0}^n\binom{2n}{2k} = 2^{2n-1}$
102349
sum of all the numbers that can be formed using the digits 2,3,3,4,4,4..
148745
Determine if a number is the sum of two triangular numbers.
115719
Find the possible values of |A + B + C |
20443
Calculate sum of squares of first $n$ odd numbers
7891
Sum of nth roots of unity
101573
Subtracting even and odd binomial coefficients?
26973
Relation between Pascal's triangle and fibonacci series.
61270
Binomial Theorem Sum
135458
When is a sum of consecutive squares equal to a square?
99634
$\binom{n}{1},\binom{n}{2},\ldots ,\binom{n}{n-1}$ are all even numbers.
34803
Evaluating even binomial coefficients
70354
Find the sum of all the multiples of 3 or 5 below 1000
142978
combinatorics: sum of product of integer compositions
122891
integer as sum of three binomials
127848
Determine which Fibonacci numbers are even
38018
Arrangement of integers in a row such that the sum of every two adjacent numbers is a perfect square.