Konstantinos Gaitanas

# 27 Questions

4
21
1
714
views

7
20
3
5k
views

3
14
3
1k
views

3
12
1
877
views

3
11
3
603
views

1
11
3
709
views

1
10
0
179
views

### Product of four consecutive primes plus $1$ equals square

Mar 20 '18 at 10:20 Konstantinos Gaitanas 2,041
2
10
1
463
views

3
10
1
546
views

9
2
242
views

4
8
1
348
views

1
6
1
206
views

3
6
3
964
views

1
5
0
224
views

### The sum of all the elements of every non empty subset of $A$ is not a multiple of $n$

Oct 30 '14 at 21:35 Konstantinos Gaitanas 2,041
1
5
0
935
views

### $\sum_{n=1}^{\infty}\frac{1}{a_n}=\infty$ $\sum_{n=1}^{\infty}\frac{1}{b_n}=\infty$ but $\sum_{n=1}^{\infty}\frac{1}{a_n+b_n}=c, c\in R$ [closed]

Dec 20 '13 at 22:35 Community 1
2
4
1
227
views

1
3
1
228
views

2
2
2
748
views

1
vote
1
72
views

1
1
vote
0
56
views

### On the sum of digits of primes in binary form [duplicate]

Jan 25 '16 at 10:45 Konstantinos Gaitanas 2,041
2
1
vote
0
271
views

### Is there a “complete” Sidon sequence?

Nov 17 '15 at 10:14 Konstantinos Gaitanas 2,041
1
1
vote
1
240
views

2
1
vote
2
601
views

1
vote
3
3k
views

1
1
vote
0
199
views

### Calculating a simple sum [closed]

Aug 25 '13 at 15:37 Konstantinos Gaitanas 2,041
1
0
6
547
views

0