zeraoulia rafik
• Member for 7 years, 6 months
• Last seen this week
• algeria, khenchela, yabous

# 44 Questions

11
50
4
7k
views

24
45
3
6k
views

1
25
0
2k
views

### What do you like in the mathematics of Vaughan Jones? And how Vaughan Jones liked mathematics to be? [closed]

Oct 8 '20 at 18:44 zeraoulia rafik 2,305
4
17
3
3k
views

4
8
1
499
views

6
1
1k
views

2
6
1
599
views

5
3
605
views

2
4
1
2k
views

1
4
4
479
views

1
4
1
378
views

3
2
483
views

3
1
368
views

3
3
3
602
views

1
3
0
221
views

### Any counter example for this: ${\phi(2^n-1)} \bmod \tau(2^n-1)=0$ for every integer $n \geq 1$? [closed]

Nov 10 '16 at 0:12 CommunityBot 1

3
1
506
views

1
2
1
836
views

2
0
92
views

### if such counter example exists for Lehmer's totient problem could we prove that there are infinity of them or just finitely?

Aug 1 '20 at 23:50 zeraoulia rafik 2,305
1
2
0
349
views

### For which values of $x$ we have $\sum\limits_{n=0}^{\infty}x^{\tan(n!)-n!}$ converges?

Jun 2 '20 at 17:46 CommunityBot 1
1
2
1
559
views

1
vote
0
150
views

### Is $T(n)=\sum_{k=1}^{n}\frac{\lambda(k)\Lambda(k)}{k} \geq 0$ and what is the upper bound of $T(x)=\sum_{n\leq x} \lambda(n)\Lambda(n)$?

Oct 16 '20 at 23:41 YCor 48k

1
vote
2
160
views

1
vote
1
154
views

1
vote
1
273
views

1
vote
0
86
views

### What is the class of real sequences satisfying these conditions?

Dec 22 '16 at 23:13 Arturo Magidin 6,792

1
vote
0
96
views

### Is $n=5$ the only integer satisfy the equation :$\sigma((n-1)!+1))=\sigma(n²)$? [closed]

Nov 3 '16 at 22:09 zeraoulia rafik 2,305

1
vote
1
139
views

1
vote
1
350
views

0
1
109
views

0