List questions from decimal-expansion

Published on 28 Mar 2026 - 13:41

61

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Define function that tells me if an integer is a zero_special

Published on 01 Sep 2022 - 10:54

68

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Reference request: A. Schinzel on digital sums of powers

Published on 27 Mar 2026 - 21:17

150

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Are there two unequal decimal numbers where the integer part is the same and the decimal expansion is reversed such that there sum is an integer?

Published on 07 Sep 2022 - 17:57

90

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Calculating expected number of attempts to find a large palindromic prime in digits of $\pi$

Published on 09 Sep 2022 - 20:06

52

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Looking for an efficient way to multiply "powered digits"

Published on 19 Sep 2022 - 7:01

273

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Number theory approach to Project Euler's "Large Sum" problem?

Published on 13 Oct 2022 - 19:04

135

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Prove $S(1981^n) \geq 19$

Published on 25 Oct 2022 - 19:29

296

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Average period of the decimal expansion of reciprocals of prime numbers

Published on 25 Oct 2022 - 22:26

327

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Are there any perfect squares of the form $\underbrace{88\cdots8}_{n\text{ times}}1$ (in decimal, at least two $8$'s)?

Published on 27 Mar 2026 - 22:53

54

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A function from [0,1] to [0,1] which seems to be continuous but still cannot be.

Published on 29 Oct 2022 - 21:32

64

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How to expand $\pi$ in non-decimal bases?

Published on 30 Mar 2026 - 16:24

81

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How to find how frequently a specific digit appears in a number?

Published on 06 Nov 2022 - 17:38

57

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How to Solve Number System Problem

Published on 30 Mar 2026 - 16:22

83

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Convert Base16 to Base10

Published on 20 Nov 2022 - 23:42

List Question

Finding large palindromic primes in the decimal expansion of pi

Define function that tells me if an integer is a zero_special

Reference request: A. Schinzel on digital sums of powers

Are there two unequal decimal numbers where the integer part is the same and the decimal expansion is reversed such that there sum is an integer?

Calculating expected number of attempts to find a large palindromic prime in digits of $\pi$

Looking for an efficient way to multiply "powered digits"

Number theory approach to Project Euler's "Large Sum" problem?

Prove $S(1981^n) \geq 19$

Average period of the decimal expansion of reciprocals of prime numbers

Are there any perfect squares of the form $\underbrace{88\cdots8}_{n\text{ times}}1$ (in decimal, at least two $8$'s)?

A function from [0,1] to [0,1] which seems to be continuous but still cannot be.

How to expand $\pi$ in non-decimal bases?

How to find how frequently a specific digit appears in a number?

How to Solve Number System Problem

Convert Base16 to Base10

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