Question

Finding the 23th digit after decimal point of $(8+3\sqrt{7})^{2023}$

score 248 · Answer 1 · 2023-04-17 10:02:03

248

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Finding the 23th digit after decimal point of $(8+3\sqrt{7})^{2023}$

Published on 17 Apr 2023 - 10:02

score 82 · Answer 2 · 2023-04-23 05:41:28

82

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How do you express a periodic/repeating decimal in expanded notation, especially algebraically?

Published on 23 Apr 2023 - 5:41

score 47 · Answer 3 · 2023-04-23 22:27:50

47

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Are there names for components of a decimal expansion?

Published on 23 Apr 2023 - 22:27

score 32 · Answer 4 · 2026-02-23 09:26:03

32

Views

Is there a name for such rounding algorithm?

Published on 23 Feb 2026 - 9:26

score 81 · Answer 5 · 2026-03-28 02:04:36

81

Views

Useful length of Pi?

Published on 28 Mar 2026 - 2:04

score 173 · Answer 6 · 2026-03-28 05:23:17

173

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Question about the collection of the prime factors of a fibonacci number

Published on 28 Mar 2026 - 5:23

score 201 · Answer 7 · 2023-05-29 21:24:41

201

Views

Proof of $\inf\left \{ \frac{\mathrm{d} (n^2)}{\mathrm{d} (n)} \; \bigg| \; n \in \mathbb{N} \right \}=0$, where $d(n)$ is the sum of digits of $n$

Published on 29 May 2023 - 21:24

score 172 · Answer 8 · 2026-03-26 01:12:38

172

Views

Call $n\in\Bbb N$ "balanced" if the sum of its digits equals the count of its divisors. How many "balanced" numbers are there up to $m$?

Published on 26 Mar 2026 - 1:12

score 122 · Answer 9 · 2026-03-25 22:03:39

122

Views

Proving that there are infinite primes with digit sum 8 in base 10

Published on 25 Mar 2026 - 22:03

score 80 · Answer 10 · 2023-06-13 12:26:13

80

Views

Calculating the length of a decimal expansion in constant time

Published on 13 Jun 2023 - 12:26

score 79 · Answer 11 · 2023-06-16 20:15:43

79

Views

Formula for calculating the difference between sums of digits in the same base for $(n-1)$ and $n$

Published on 16 Jun 2023 - 20:15

score 333 · Answer 12 · 2023-06-24 18:05:22

333

Views

How many numbers less than N have a prime sum of digits?

Published on 24 Jun 2023 - 18:05

score 212 · Answer 13 · 2023-06-29 16:09:00

212

Views

Proof that a repeating decimal has non-repeating digits after decimal iff denuminator has factors of 2 or 5 besides other prime factors

Published on 29 Jun 2023 - 16:09

score 53 · Answer 14 · 2026-02-23 03:26:54

53

Views

Analogue to emirp for Carmichael numbers

Published on 23 Feb 2026 - 3:26

score 50 · Answer 15 · 2023-07-01 19:31:10

50

Views

why does the sequence of n/7 always have the same six digits in the same order in the decimal part?

Published on 01 Jul 2023 - 19:31

List Question

Finding the 23th digit after decimal point of $(8+3\sqrt{7})^{2023}$

How do you express a periodic/repeating decimal in expanded notation, especially algebraically?

Are there names for components of a decimal expansion?

Is there a name for such rounding algorithm?

Useful length of Pi?

Question about the collection of the prime factors of a fibonacci number

Proof of $\inf\left \{ \frac{\mathrm{d} (n^2)}{\mathrm{d} (n)} \; \bigg| \; n \in \mathbb{N} \right \}=0$, where $d(n)$ is the sum of digits of $n$

Call $n\in\Bbb N$ "balanced" if the sum of its digits equals the count of its divisors. How many "balanced" numbers are there up to $m$?

Proving that there are infinite primes with digit sum 8 in base 10

Calculating the length of a decimal expansion in constant time

Formula for calculating the difference between sums of digits in the same base for $(n-1)$ and $n$

How many numbers less than N have a prime sum of digits?

Proof that a repeating decimal has non-repeating digits after decimal iff denuminator has factors of 2 or 5 besides other prime factors

Analogue to emirp for Carmichael numbers

why does the sequence of n/7 always have the same six digits in the same order in the decimal part?

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