List questions from decimal-expansion

Published on 30 Apr 2014 - 17:42

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Is $0.1010010001000010000010000001 \ldots$ transcendental?

Published on 21 Mar 2026 - 22:50

468

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Regularities when $n$ and $2n$ contain the same digits

Published on 05 May 2014 - 18:15

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Last Two digits of ${14}^{{14}^{14}}$

Published on 06 May 2014 - 11:52

151

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Strange notation for a decimal expansion of a transcendental number

Published on 22 Mar 2026 - 15:32

1.4k

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Binary expansion

Published on 08 May 2014 - 11:00

258

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Value of $x=\sum\limits_{n=1}^\infty {\frac{1}{10^n-1}} $ and location of second digit $1$ of $x$

Published on 10 May 2014 - 2:15

3k

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Last 3 digits of $3^{999}$

Published on 10 May 2014 - 13:40

60

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Two orthonormal vectors in space with finite decimal representation

Published on 16 May 2014 - 13:42

348

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Cannot find length of repeating block in decimal expansion for $\frac{17}{78}$

Published on 20 May 2014 - 5:59

471

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patterns in the decimal expansions of adjacent square and cube roots

Published on 27 May 2014 - 13:03

329

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Prove that in any base the number of digits composing the repetitive mantissa of the reciprocal of a prime $p$ never exceeds $p-1$.

Published on 25 Mar 2026 - 12:50

320

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Compute and find 2009th decimal(2009th digit after the point), without automation, the following sum

Published on 01 Jun 2014 - 2:46

9.5k

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Sum of digits of number from 1 to n

Published on 01 Jun 2014 - 13:58

1.2k

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Sum of all $4$-digit squares of a specific form

Published on 05 Jun 2014 - 9:15

List Question

Mixed repeating decimals

Is $0.1010010001000010000010000001 \ldots$ transcendental?

Regularities when $n$ and $2n$ contain the same digits

Last Two digits of ${14}^{{14}^{14}}$

Strange notation for a decimal expansion of a transcendental number

Binary expansion

Value of $x=\sum\limits_{n=1}^\infty {\frac{1}{10^n-1}} $ and location of second digit $1$ of $x$

Last 3 digits of $3^{999}$

Two orthonormal vectors in space with finite decimal representation

Cannot find length of repeating block in decimal expansion for $\frac{17}{78}$

patterns in the decimal expansions of adjacent square and cube roots

Prove that in any base the number of digits composing the repetitive mantissa of the reciprocal of a prime $p$ never exceeds $p-1$.

Compute and find 2009th decimal(2009th digit after the point), without automation, the following sum

Sum of digits of number from 1 to n

Sum of all $4$-digit squares of a specific form

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