# 33 Questions

40
59
19
10k
views

30
45
4
6k
views

8
30
2
5k
views

9
25
3
3k
views

9
22
1
2k
views

9
17
2
1k
views

10
17
2
612
views

9
12
2
2k
views

5
10
1
387
views

2
8
1
764
views

5
7
0
254
views

### Are there infinitely many zeroes of $\sum_{r = 1}^{n-1} \mu(r)\gcd(n,r)$?

Jul 26 at 1:13 Nilotpal Kanti Sinha 3,460
7
6
1
252
views

3
6
1
171
views

3
6
3
654
views

4
5
0
296
views

### What is the sum of the binomial coefficients ${n\choose p}$ over prime numbers?

Sep 27 '18 at 5:48 Nilotpal Kanti Sinha 3,460
7
5
6
2k
views

3
4
0
108
views

### Is finding positive integer solutions of $\zeta(a/b) = c$ equivalent to deciding the rationality of $\gamma$?

Jan 25 at 14:06 Nilotpal Kanti Sinha 3,460
2
4
0
78
views

### Is the ratio of a number to the variance of its divisors injective?

Aug 9 at 23:40 Geoff Robinson 33.6k
2
4
2
1k
views

4
2
253
views

1
4
2
412
views

2
4
2
658
views

2
3
0
249
views

### If $p^2 - q^2$ is a perfect square where $p$ and $q$ are primes $> 5000$ then is one of its prime factors always greater than $17$? [closed]

Dec 28 at 16:31 Nilotpal Kanti Sinha 3,460
2
3
2
425
views

2
3
1
241
views

1
3
3
711
views

1
2
0
116
views

### How many divisors of $\phi(m)$ do not divide $m-1$?

Sep 2 at 6:12 Nilotpal Kanti Sinha 3,460
2
2
1
481
views

2
1
vote
0
41
views

### Mean value of a function with binomial coefficients as weights

Aug 10 at 15:33 Nilotpal Kanti Sinha 3,460
1
1
vote
0