1. Home
2. Questions
3. Tags
5. Users
6. Unanswered
Teams

Now available on Stack Overflow for Teams! AI features where you work: search, IDE, and chat.
Learn more Explore Teams
Teams
Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Explore Teams

S.C.B.

Member for 8 years, 7 months
Last seen this week

Twitter
Seoul, South Korea

Summary

Reputation

22,918

22.9k
22.6k
22.3k

2021
2022
2023
2024

Top tag

elementary-number-theory

Next privilege

25,000 Rep.

Access to site analytics

Badges

3

38

62

Newest

Enlightened

Next badge

40/50

Epic

Impact

~474k

people reached

35

helpful flags

1,311

votes cast

Answers

View all 494 answers

44

Multiple-choice: sum of primes below $1000$

Jan 30, 2017

35

Prove that 10101...10101 is NOT a prime.

Feb 11, 2016

32

What is a square root?

Mar 7, 2016

25

How to prove that $\frac{1000!}{(500!)^2}$ is not divisible by 7?

Jan 24, 2017

20

Prove $\frac{a^3+b^3+c^3}{3}\frac{a^7+b^7+c^7}{7} = \left(\frac{a^5+b^5+c^5}{5}\right)^2$ if $a+b+c=0$

Feb 18, 2016

Questions

View all 19 questions

45

Which derivatives are eventually periodic?

Feb 9, 2016

27

Numbers that are clearly NOT a Square

Feb 14, 2016

14

Are the fractional parts of powers of $\pi$ divergent?

May 5, 2016

9

Find all $f:\mathbb {R} \rightarrow \mathbb {R}$ where $f(f(x))=f'(x)f(x)+c$

Feb 5, 2016

7

Finding the minimum of $x^2+y^2$ for $(x^2y-xy^2)(x^3-y^3)=x^3+y^3$ and $xy>0$.

Feb 8, 2016

Tags

View all 168 tags

elementary-number-theory

389

Score

100

posts

algebra-precalculus

281

Score

67

posts

calculus

236

Score

75

posts

number-theory

205

Score

55

posts

inequality

196

Score

50

posts

Reputation

+10

Can this be done without substitution of values?

+10

Two interesting results in integration $\int_{0}^{a}f(a-x) \ \mathrm{d}x= \int_{0}^{a}f(x)\ \mathrm{d}x$ and differentiation of powers of functions

+10

Simplify $z^7\div z^{-x}\cdot z^{-y^{2}}$

+10

How does factorials work in algebraic equations?

Badges

View all badges

3

gold badges

Copy Editor

Jan 29, 2017
Electorate

Feb 15, 2017
Fanatic

May 14, 2016

38

silver badges

Refiner

Jan 26, 2017
Generalist

Mar 5, 2017
Pundit

Feb 14, 2017

62

bronze badges

inequality

Feb 6, 2017
number-theory

Jan 13, 2017
elementary-number-theory

Mar 18, 2016

Accounts

View all 14 accounts

22.9k
3
38
62

Korean Language

191
1
3

151
1

English Language Learners

103
4

101
2

Active bounties (0)

This user has no active bounties

Votes cast

1,308

upvotes

3

downvotes

669

question votes

642

answer votes