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Mathematics
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Ekesh Kumar's user avatar
Ekesh Kumar's user avatar
Ekesh Kumar
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31
Is $1111111111111111111111111111111111111111111111111111111$ ($55$ $1$'s) a composite number?
Jan 29, 2019
12
Harvard To Mit Math Competition [2004]
Jan 29, 2019
9
Determine if a graph exists knowing the degree of its vertices
Jan 21, 2019
8
Given a three digit number $n$, let $f(n)$ be the sum of digits of $n$, their products in pairs, and the product of all digits. When does $n=f(n)$?
Nov 19, 2018
7
prove or disprove that:$a^2+b^2+c^2\leq \frac{27}{4}$
Jun 23, 2022
5
Sequence of $0$’s and $1$’s without six consecutive identical blocks
Jul 18, 2022
5
How do you find the number of contiguous subarrays of size $k$ in a given array?
Aug 16, 2020
4
Let P be the set of all prime numbers. Prove that $| \mathbb{P}| = |\mathbb{N}|$
Nov 14, 2018
4
How to calculate E[X+Y] and E[(X+Y)^2]
Dec 19, 2019
4
Inequality $((4000 - x)^2 - (3200 - x)^2) > ((2100 - y)^2 - (4000 - y)^2)$
Jul 7, 2021