Question

Number of elements $n \in \{1, ..., 100 \}$ such that $n^{4} - 20n^{2} + 100$ is of the form $k^{4}$ with $k$ an integer.

score 462 · Answer 1 · 2026-04-22 19:13:48

462

Views

Number of elements $n \in \{1, ..., 100 \}$ such that $n^{4} - 20n^{2} + 100$ is of the form $k^{4}$ with $k$ an integer.

Published on 22 Apr 2026 - 19:13

score 178 · Answer 2 · 2026-05-11 03:17:26

178

Views

What is the number of elements in $\{1,2,...,2018\}$ such that it can be represented by $ x^{6} + x^{5} + x^{4} + x^{3} + x^{2} + x + 1 \:\:? $

Published on 11 May 2026 - 3:17

score 161 · Answer 3 · 2026-04-11 11:34:39

161

Views

How t0 find numbers divisible by 3 between 200 and 400 without testing every number in the range?

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score 56 · Answer 4 · 2026-05-10 17:00:21

56

Views

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score 73 · Answer 5 · 2026-05-10 17:02:29

73

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score 643 · Answer 6 · 2026-04-15 06:04:15

643

Views

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Published on 15 Apr 2026 - 6:04

score 133 · Answer 7 · 2026-05-11 00:43:23

133

Views

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score 187 · Answer 8 · 2026-04-10 12:50:37

187

Views

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Published on 10 Apr 2026 - 12:50

score 3k · Answer 9 · 2026-05-11 00:02:17

3k

Views

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score 212 · Answer 10 · 2026-04-21 00:33:51

212

Views

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Published on 21 Apr 2026 - 0:33

score 25 · Answer 11 · 2026-05-10 18:44:34

25

Views

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score 445 · Answer 12 · 2026-04-10 19:44:40

445

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score 113 · Answer 13 · 2026-04-14 03:35:50

113

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score 98 · Answer 14 · 2026-05-10 17:01:58

98

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score 386 · Answer 15 · 2026-05-10 14:53:23

386

Views

Numbers whose decimal digits are the coefficients of its continued fraction form

Published on 10 May 2026 - 14:53

List Question

Number of elements $n \in \{1, ..., 100 \}$ such that $n^{4} - 20n^{2} + 100$ is of the form $k^{4}$ with $k$ an integer.

What is the number of elements in $\{1,2,...,2018\}$ such that it can be represented by $ x^{6} + x^{5} + x^{4} + x^{3} + x^{2} + x + 1 \:\:? $

How t0 find numbers divisible by 3 between 200 and 400 without testing every number in the range?

How do I find the total number of bell tollings and avoid the flagpole error?

What is the best way to solve a puzzle involving sets of information which seem in disorder?

Why is the one's digit of the product of 6 consecutive positive whole numbers is always zero?

What method can be used to solve a numeric finding puzzle involving getting the right sum?

How can I find the total number of figures in a puzzle where they seem to overlap?

What method can be used to solve a magic square problem without just guessing?

Tetris: What is the Polyomino (max 3x3) with the least probability of being useful to the player?

Derivation of proportion of population given rates

Prisoners wearing infinite stack of hats

hunting aliens probability brainteaser

How to find the least number of objects in a set involving gender?

Numbers whose decimal digits are the coefficients of its continued fraction form

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