List questions from decimal-expansion

Published on 13 Jan 2017 - 14:23

84

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Why these two solutions are always equal?

Published on 14 Jan 2017 - 10:37

53

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Tools for determining the "central" digits of large integer powers (or lack thereof)?

Published on 19 Jan 2017 - 16:38

1.5k

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Why does $987,654,321$ divided by $123,456,789 = 8$?

Published on 19 Jan 2017 - 23:30

572

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Use this hint to show that any decimal expansion which is eventually periodic

Published on 20 Jan 2017 - 18:47

209

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Is every irrational number containing only $2$ distinct digits, transcendental?

Published on 27 Mar 2026 - 4:57

461

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How are Trott constants found; are there mathematical results?

Published on 25 Mar 2026 - 7:43

147

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If $a+b=10^{50}$ then show $10|a$

Published on 21 Jan 2017 - 13:36

572

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Why is $9 \times 11{\dots}12 = 100{\dots}08$?

Published on 21 Jan 2017 - 14:06

178

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Combinatorics - Show that $2^n = 1987 \dots $

Published on 23 Jan 2017 - 4:31

127

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Is there a number that is palindromal in both base 2 and base 3?

Published on 25 Mar 2026 - 12:26

316

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Analysis of a proof that the decimal expression for any rational is periodic.

Published on 05 Feb 2017 - 6:00

7.8k

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Is there any mathematical reason for this "digit-repetition-show"?

Published on 08 Feb 2017 - 13:02

68

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Showing Rationals are Countable - Confusing Notation

Published on 10 Feb 2017 - 3:22

102

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Divisibility of elements of $\{ \overline{abcde},\overline{bcdea},\overline{cdeab},\overline{deabc},\overline{eabcd}\}$ by $41$

Published on 10 Feb 2017 - 18:56

List Question

Write a product of two numbers in non decimal base

Why these two solutions are always equal?

Tools for determining the "central" digits of large integer powers (or lack thereof)?

Why does $987,654,321$ divided by $123,456,789 = 8$?

Use this hint to show that any decimal expansion which is eventually periodic

Is every irrational number containing only $2$ distinct digits, transcendental?

How are Trott constants found; are there mathematical results?

If $a+b=10^{50}$ then show $10|a$

Why is $9 \times 11{\dots}12 = 100{\dots}08$?

Combinatorics - Show that $2^n = 1987 \dots $

Is there a number that is palindromal in both base 2 and base 3?

Analysis of a proof that the decimal expression for any rational is periodic.

Is there any mathematical reason for this "digit-repetition-show"?

Showing Rationals are Countable - Confusing Notation

Divisibility of elements of $\{ \overline{abcde},\overline{bcdea},\overline{cdeab},\overline{deabc},\overline{eabcd}\}$ by $41$

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