List questions from decimal-expansion

Published on 29 Mar 2026 - 5:49

1.3k

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Variation of the Kempner series – convergence of series $\sum\frac{1}{n}$ where $9$ is not a digit of $1/n$.

Published on 06 Feb 2016 - 17:36

211

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Does every positive integer appear in the digits of $2\cdot 0.1234567891011… $?

Published on 09 Feb 2016 - 14:37

389

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Write negative decimal in binary(octal etc..) by hand

Published on 09 Feb 2016 - 17:13

695

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Decimals of the square root of $n$.

Published on 10 Feb 2016 - 21:57

473

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How do i find three successive natural odd numbers for which the sum of their squares can be written in decimal system as :$\overline{xxxx} $?

Published on 13 Feb 2016 - 7:49

1.2k

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Is there any palindromic power of $2$?

Published on 13 Feb 2016 - 10:53

75

Views

Is $\sigma(2^r)$ a palindrome (in base $10$) for some $r > 2$, where $\sigma$ is the sum-of-divisors function?

Published on 29 Mar 2026 - 23:48

394

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Swapping the digits of an algebraic number (e.g. $\sqrt 2$)

Published on 28 Mar 2026 - 2:22

967

Views

Is $0.248163264128…$ a transcendental number?

Published on 28 Mar 2026 - 2:27

1.7k

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prove that $\sqrt{2}$ is not periodic.

Published on 19 Feb 2016 - 2:58

9.5k

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Factorial question: number of trailing zeroes in 125!

Published on 22 Feb 2016 - 4:37

67

Views

Proof Regarding Decimal Expansions

Published on 23 Feb 2016 - 19:14

562

Views

In a given range how can i find how many times a two digit number appears ?

Published on 30 Mar 2026 - 14:56

963

Views

What does the bar means for an integer (for example $\overline{323}^6$ and $\overline{35}^6$)?

Published on 02 Mar 2016 - 8:01

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Error with the proof that all solutions to the Cauchy Functional Equation are linear

Variation of the Kempner series – convergence of series $\sum\frac{1}{n}$ where $9$ is not a digit of $1/n$.

Does every positive integer appear in the digits of $2\cdot 0.1234567891011… $?

Write negative decimal in binary(octal etc..) by hand

Decimals of the square root of $n$.

How do i find three successive natural odd numbers for which the sum of their squares can be written in decimal system as :$\overline{xxxx} $?

Is there any palindromic power of $2$?

Is $\sigma(2^r)$ a palindrome (in base $10$) for some $r > 2$, where $\sigma$ is the sum-of-divisors function?

Swapping the digits of an algebraic number (e.g. $\sqrt 2$)

Is $0.248163264128…$ a transcendental number?

prove that $\sqrt{2}$ is not periodic.

Factorial question: number of trailing zeroes in 125!

Proof Regarding Decimal Expansions

In a given range how can i find how many times a two digit number appears ?

What does the bar means for an integer (for example $\overline{323}^6$ and $\overline{35}^6$)?

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