Question

Intersection of an ideal in a subring

score 333 · Answer 1 · 2016-10-29 05:22:23

333

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Intersection of an ideal in a subring

Published on 29 Oct 2016 - 5:22

score 372 · Answer 2 · 2016-10-30 14:41:21

372

Views

I want to find a pair of integers $X$, $Y$ which satisfy $X^2 - 2Y^2=1$ such that $X > Y > 50$

Published on 30 Oct 2016 - 14:41

score 85 · Answer 3 · 2026-03-27 20:53:59

85

Views

Definite sum of a decreasing series

Published on 27 Mar 2026 - 20:53

score 12.2k · Answer 4 · 2026-03-30 00:22:55

12.2k

Views

Prove that for any set of 5 integers, there is at least one subset of 3 integers whose sum is divisible by 3

Published on 30 Mar 2026 - 0:22

score 298 · Answer 5 · 2016-11-05 16:52:06

298

Views

For which values of positive integer k is it possible to divide the first 3k positive integers into three groups with the same sum?

Published on 05 Nov 2016 - 16:52

score 35 · Answer 6 · 2016-11-09 16:46:46

35

Views

Problems on numbers

Published on 09 Nov 2016 - 16:46

score 60 · Answer 7 · 2016-11-10 04:02:36

60

Views

Finding 9-digit Positive Integers with Specific Decimal Digits that are Divisible by a Specific number

Published on 10 Nov 2016 - 4:02

score 96 · Answer 8 · 2016-11-12 09:48:42

How to show $[i]+[j]= [i+j]$ and $[i][j]= [ij]$ where $[i], [j]$ belong to the set of congruence class of mod $n$?

score 42 · Answer 9 · 2016-11-14 04:58:08

42

Views

Birthday Coincidence

Published on 14 Nov 2016 - 4:58

score 178 · Answer 10 · 2026-03-27 06:18:42

178

Views

1 : 1 Mapping of integers to decimals

Published on 27 Mar 2026 - 6:18

score 116 · Answer 11 · 2016-11-14 19:52:43

116

Views

why aren't the integers open?

Published on 14 Nov 2016 - 19:52

score 306 · Answer 12 · 2016-11-15 02:40:36

306

Views

How can I show that this is an integer for all positive integers $a$ and $n$?

Published on 15 Nov 2016 - 2:40

score 52 · Answer 13 · 2016-11-15 22:18:42

52

Views

When does $n$ and $n+2$ are primes with $n >1$ odd integer?

Published on 15 Nov 2016 - 22:18

score 64 · Answer 14 · 2016-11-22 07:43:40

64

Views

How can transform a product into sum of two squares

Published on 22 Nov 2016 - 7:43

score 86 · Answer 15 · 2016-11-23 11:55:42

86

Views

Find all $n\in\mathbb N$ such that $\sqrt{n^2+8n-5}$ is an integer.

Published on 23 Nov 2016 - 11:55

List Question

Intersection of an ideal in a subring

I want to find a pair of integers $X$, $Y$ which satisfy $X^2 - 2Y^2=1$ such that $X > Y > 50$

Definite sum of a decreasing series

Prove that for any set of 5 integers, there is at least one subset of 3 integers whose sum is divisible by 3

For which values of positive integer k is it possible to divide the first 3k positive integers into three groups with the same sum?

Problems on numbers

Finding 9-digit Positive Integers with Specific Decimal Digits that are Divisible by a Specific number

How to show $[i]+[j]= [i+j]$ and $[i][j]= [ij]$ where $[i], [j]$ belong to the set of congruence class of mod $n$?

Birthday Coincidence

1 : 1 Mapping of integers to decimals

why aren't the integers open?

How can I show that this is an integer for all positive integers $a$ and $n$?

When does $n$ and $n+2$ are primes with $n >1$ odd integer?

How can transform a product into sum of two squares

Find all $n\in\mathbb N$ such that $\sqrt{n^2+8n-5}$ is an integer.

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