Question

Can I efficiently enumerate all numbers in a range that have a prime factor in another given range?

score 48 · Answer 1 · 2018-12-03 18:49:00

48

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Can I efficiently enumerate all numbers in a range that have a prime factor in another given range?

Published on 03 Dec 2018 - 18:49

score 298 · Answer 2 · 2018-12-05 16:51:36

298

Views

Where is the mistake: On the sum of two prime numbers.

Published on 05 Dec 2018 - 16:51

score 254 · Answer 3 · 2018-12-12 22:30:13

254

Views

Is there a term for numbers whose sum of prime factors are "amicable"

Published on 12 Dec 2018 - 22:30

score 115 · Answer 4 · 2018-12-12 22:44:01

115

Views

Determine the number of positive integers $a$ such that $a\mid 9!$ and gcd $(a, 3600)=180$.

Published on 12 Dec 2018 - 22:44

score 382 · Answer 5 · 2018-12-14 16:04:56

382

Views

Proving the product of an odd number and the power of 2 is bijective

Published on 14 Dec 2018 - 16:04

score 78 · Answer 6 · 2018-12-15 20:05:46

78

Views

Show that any prime divisor of $x^4+x^3+x^2+x+1$, with $x\in\mathbb{N}$, is $5$ or $1$ mod $5$

Published on 15 Dec 2018 - 20:05

score 397 · Answer 7 · 2018-12-19 09:18:24

397

Views

Maximum number of distinct prime factors of numbers below $2^{64}$

Published on 19 Dec 2018 - 9:18

score 1.4k · Answer 8 · 2018-12-21 14:46:37

1.4k

Views

Are all highly composite numbers even?

Published on 21 Dec 2018 - 14:46

score 365 · Answer 9 · 2018-12-21 19:46:24

365

Views

Countability of Algebraic numbers proving the existence of some equality?

Published on 21 Dec 2018 - 19:46

score 83 · Answer 10 · 2026-03-25 21:01:24

83

Views

Probability for composite $n$ to have prime factor $\geq \sqrt n$

Published on 25 Mar 2026 - 21:01

score 23 · Answer 11 · 2026-03-25 22:03:07

23

Views

Conditions for solutions to $p^a = q^b$

Published on 25 Mar 2026 - 22:03

score 46 · Answer 12 · 2026-03-25 03:03:15

46

Views

Assuming X = A + B * C, where A & B are integers, C is irrational; Find A & B given X & C

Published on 25 Mar 2026 - 3:03

score 598 · Answer 13 · 2019-01-02 04:18:28

598

Views

How to express 80^2/3 as a product of powers of prime numbers

Published on 02 Jan 2019 - 4:18

score 4.4k · Answer 14 · 2026-03-25 14:22:59

4.4k

Views

If a prime $p$ divides $n^2$ then it also divides $n$ - Is this proof correct?

Published on 25 Mar 2026 - 14:22

score 237 · Answer 15 · 2026-03-25 06:19:27

237

Views

Relation between The Euler Totient, the counting prime formula and the prime generating Functions

Published on 25 Mar 2026 - 6:19

List Question

Can I efficiently enumerate all numbers in a range that have a prime factor in another given range?

Where is the mistake: On the sum of two prime numbers.

Is there a term for numbers whose sum of prime factors are "amicable"

Determine the number of positive integers $a$ such that $a\mid 9!$ and gcd $(a, 3600)=180$.

Proving the product of an odd number and the power of 2 is bijective

Show that any prime divisor of $x^4+x^3+x^2+x+1$, with $x\in\mathbb{N}$, is $5$ or $1$ mod $5$

Maximum number of distinct prime factors of numbers below $2^{64}$

Are all highly composite numbers even?

Countability of Algebraic numbers proving the existence of some equality?

Probability for composite $n$ to have prime factor $\geq \sqrt n$

Conditions for solutions to $p^a = q^b$

Assuming X = A + B * C, where A & B are integers, C is irrational; Find A & B given X & C

How to express 80^2/3 as a product of powers of prime numbers

If a prime $p$ divides $n^2$ then it also divides $n$ - Is this proof correct?

Relation between The Euler Totient, the counting prime formula and the prime generating Functions

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