Sum calculation of combination with floor
87589
Evaluate $\binom{n}{0}+\binom{n}{2}+\binom{n}{4}+...+\binom{n}{2k}$
13098
Find a formula for $\sum\limits_{k=1}^n \lfloor \sqrt{k} \rfloor$
96791
How to show that $\lfloor n/1\rfloor+\lfloor n/2 \rfloor+....+\lfloor n/n\rfloor+\lfloor{\sqrt{n}}\rfloor$ is even?
57986
Sum of products of combinatorials
114228
Find the number of solutions to $ \lfloor x \rfloor + \lfloor 2x \rfloor + \lfloor 4x \rfloor + \ldots + \lfloor 32x \rfloor =12345$
141978
How to find the infinite sum
1739
Adding two numbers concatenates them instead of calculating the sum
117604
Sum of the rows of Pascal's Triangle.
155479
Summation of inner products
53383
Sum of items in a collection
13953
Floor function of a product
71047
Sum the digits of a number
38811
Solutions to $\frac1{\lfloor x\rfloor}+\frac1{\lfloor 2x\rfloor}=\{x\}+\frac13$
71394
Prove the following floor function identity
74471
Sum of numbers at vertex/face of cube
49912
Generating ordered combination of numbers
19776
Simplify a combinatorial sum