Question

Proving a "complicated" formula using modular forms

score 86 · Answer 1 · 2026-04-11 05:08:40

86

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Proving a "complicated" formula using modular forms

Published on 11 Apr 2026 - 5:08

score 1.6k · Answer 2 · 2026-04-17 06:31:03

1.6k

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Finding numbers that double when you switch the first and last digit

Published on 17 Apr 2026 - 6:31

score 88 · Answer 3 · 2026-04-29 12:47:00

88

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How many n-colour points are needed to force a regularly-spaced set of one colour?

Published on 29 Apr 2026 - 12:47

score 81 · Answer 4 · 2026-04-13 17:53:11

81

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(n+7)(n-4)+33/121 is always a fraction

Published on 13 Apr 2026 - 17:53

score 223 · Answer 5 · 2026-04-15 20:06:58

223

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If $ab \mid c(c^2-c+1)$ and $c^2+1 \mid a+b$ then prove that $\{a, b\}=\{c, c^2-c+1 \}$

Published on 15 Apr 2026 - 20:06

score 54 · Answer 6 · 2026-05-04 08:45:54

54

Views

Sum of remaining of 2^k divided by 2003

Published on 04 May 2026 - 8:45

score 105 · Answer 7 · 2026-04-16 11:08:09

105

Views

Characters of a finite abelian group of order $5$

Published on 16 Apr 2026 - 11:08

score 123 · Answer 8 · 2026-04-14 22:23:25

123

Views

Existence of direct summand isomorphic to $\mathbb{Q}_p[P]$

Published on 14 Apr 2026 - 22:23

score 131 · Answer 9 · 2026-04-15 17:01:13

131

Views

Show that $\langle\,23 \rangle\ =\langle\, 23 , \alpha-10\rangle^2 \langle\, 23, \alpha-3 \rangle$

Published on 15 Apr 2026 - 17:01

score 165 · Answer 10 · 2026-04-16 11:07:28

Finding whether $\dfrac{2^k - (2\cdot3^{n-1} + 2^{t_0}3^{n-2} + 2^{t_0+t_1}3^{n-3} .... + 2^{t_0+t_1+...+t_{n-1}})}{3^n}$ can describe all integers

score 49 · Answer 11 · 2026-04-09 16:40:08

49

Views

Can you substitute congruences into an expression if the conditions are right?

Published on 09 Apr 2026 - 16:40

score 215 · Answer 12 · 2026-04-17 10:32:36

215

Views

Solve $a^4 + b^4 + c^4 +l^4 = a^2b^2+a^2c^2+a^2l^2+b^2c^2+b^2l^2+c^2l^2$ in integers

Published on 17 Apr 2026 - 10:32

score 267 · Answer 13 · 2026-04-16 03:45:57

267

Views

Is $\left( {{2}^{x}}-1 \right)\left( {{5}^{x}}-1 \right)$ a square number for integer $x>1$

Published on 16 Apr 2026 - 3:45

score 112 · Answer 14 · 2026-04-12 01:45:39

112

Views

Proof verification for irrationality of $\sqrt{n}$, when $n$ is not the square of a positive integer.

Published on 12 Apr 2026 - 1:45

score 123 · Answer 15 · 2026-04-17 11:25:55

123

Views

Why is the E8 lattice free of rank 8

Published on 17 Apr 2026 - 11:25

List Question

Proving a "complicated" formula using modular forms

Finding numbers that double when you switch the first and last digit

How many n-colour points are needed to force a regularly-spaced set of one colour?

(n+7)(n-4)+33/121 is always a fraction

If $ab \mid c(c^2-c+1)$ and $c^2+1 \mid a+b$ then prove that $\{a, b\}=\{c, c^2-c+1 \}$

Sum of remaining of 2^k divided by 2003

Characters of a finite abelian group of order $5$

Existence of direct summand isomorphic to $\mathbb{Q}_p[P]$

Show that $\langle\,23 \rangle\ =\langle\, 23 , \alpha-10\rangle^2 \langle\, 23, \alpha-3 \rangle$

Finding whether $\dfrac{2^k - (2\cdot3^{n-1} + 2^{t_0}3^{n-2} + 2^{t_0+t_1}3^{n-3} .... + 2^{t_0+t_1+...+t_{n-1}})}{3^n}$ can describe all integers

Can you substitute congruences into an expression if the conditions are right?

Solve $a^4 + b^4 + c^4 +l^4 = a^2b^2+a^2c^2+a^2l^2+b^2c^2+b^2l^2+c^2l^2$ in integers

Is $\left( {{2}^{x}}-1 \right)\left( {{5}^{x}}-1 \right)$ a square number for integer $x>1$

Proof verification for irrationality of $\sqrt{n}$, when $n$ is not the square of a positive integer.

Why is the E8 lattice free of rank 8

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