zeraoulia rafik

# 45 Questions

10
47
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### What do you like in the mathematics of Vaughan Jones? And how Vaughan Jones liked mathematics to be? [closed]

Oct 8 at 18:44 zeraoulia rafik 2,243
4
17
3
2k
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4
8
1
452
views

6
1
686
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2
6
1
581
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5
3
546
views

1
4
4
463
views

2
4
2
1k
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1
4
1
375
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3
2
347
views

3
1
338
views

3
3
3
583
views

1
3
0
214
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### 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 Community 1

3
1
488
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2
2
120
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2
0
86
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### if such counter example exists for Lehmer's totient problem could we prove that there are infinity of them or just finitely?

Aug 1 at 23:50 zeraoulia rafik 2,243
1
2
0
345
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### For which values of $x$ we have $\sum\limits_{n=0}^{\infty}x^{\tan(n!)-n!}$ converges?

Jun 2 at 17:46 Community 1
1
2
1
511
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1
vote
0
113
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 at 23:41 YCor 39.6k

1
vote
1
271
views

1
vote
0
85
views

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

Dec 22 '16 at 23:13 Arturo Magidin 6,612

1
vote
0
92
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### Is $n=5$ the only integer satisfy the equation :$\sigma((n-1)!+1))=\sigma(n²)$? [closed]

Nov 3 '16 at 22:09 zeraoulia rafik 2,243

1
vote
1
134
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1
vote
1
349
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0
0
350
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### Are all zeros of $h_{t}(z)=\int_{0}^{\infty}e^{tu^2}\phi(u)\sin (zu) \mathrm{d}u$ for $t\geq \frac12$ real?

Oct 14 at 18:51 zeraoulia rafik 2,243

0
1
136
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0
1
97
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0