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Robert Soupe

Math aficionado. No formal math education beyond high school.

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Top Questions
37 votes

Did anyone wonder why there was one planet fewer before beaming down to Ceti Alpha V/VI?

star-trek the-wrath-of-khan asked Aug 5, 2014 at 2:40
scifi.stackexchange.com

32 votes

Why would the binary language of moisture vaporators be that different from the binary language of other machines or droids?

star-wars languages droids asked Aug 9, 2015 at 17:09
scifi.stackexchange.com

18 votes

Is 39 moves the longest a chess game can go moving only pawns?

recreational-mathematics asked Jul 2, 2014 at 2:44
math.stackexchange.com

14 votes

When did the writers of Star Trek decide the Federation doesn't use money?

star-trek money asked Sep 5, 2016 at 22:52
scifi.stackexchange.com

12 votes

Does the alternating sum of prime reciprocals converge?

sequences-and-series prime-numbers asked Jun 18, 2017 at 23:16
math.stackexchange.com

9 votes

What is the worst case for the Euclidean algorithm in $\mathbb Z[i]$?

algebraic-number-theory euclidean-algorithm asked Oct 14, 2018 at 23:36
math.stackexchange.com

9 votes

What is the most efficient way to replace items in a list at periodic intervals?

list-manipulation performance-tuning asked Mar 25, 2016 at 18:08
mathematica.stackexchange.com

7 votes

Under the Gregorian calendar, what days can never be Easter?

soft-question calendar-computations asked Apr 5, 2015 at 23:34
math.stackexchange.com

6 votes

Does the $5x + 1$ sequence for 7 reach a power of 2 or does it get stuck in a period?

number-theory collatz asked Jul 6, 2015 at 3:30
math.stackexchange.com

5 votes

What would be some winning strategies for a prime factorization lottery?

prime-factorization asked Jan 13, 2016 at 3:42
math.stackexchange.com

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Top Answers
28
What is Trinity Hall Prime number?
math.stackexchange.com

12
How does passing to ideals solve the problem of unique factorization?
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11
What is the name for a group of five?
music.stackexchange.com

11
What are some other ways to compute the factorials using addition only?
math.stackexchange.com

10
Is the sum of two distinct primes an injective function on integers?
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10
Describe the multiples of $21$ that ends with $241$
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9
Do we have negative prime numbers?
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9
Suppose that both $p$ and $p^2 +2$ are prime numbers. Show that $p=3$.
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9
Factoring rational primes over the Eisenstein integers - when can a prime be written as $j^2+3k^2$?
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9
Ring of algebraic integers as lattice points in the complex plane
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9
Why does the symbol for the multiplication operation change shape?
math.stackexchange.com

8
So what *is* the Euclidean function for $\mathcal{O}_{\mathbb{Q}(\sqrt{69})}$?
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8
What is the Euclidean function for $\mathbb{Z}[\sqrt{14}]$?
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8
What is the Euclidean function for $\mathbb{Z}[\sqrt{14}]$?
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8
$x^2 - (x - 1)$ is prime?
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8
Gaussian prime factorization.
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7
How are large prime numbers found?
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7
Infinite Primes proof with possible error
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7
$\textbf Z[\sqrt{pq}]$ is not a UFD if $\left( \frac{q}p \right) = -1$ and $p \equiv 1 \pmod 4$.
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7
Is there a pattern to the signs of the norms of quadratic fundamental units?
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7
Alternative form of Eisenstein integers
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7
Is there a prime $p$ whose successor is greater than $2p$?
math.stackexchange.com

7
Prove that $\sum^{n-1}_{i=1}i^{(n-1)} \equiv -1$ (mod $n$) for all prime $n\in\mathbb{N}$.
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7
Is $\mathbb{Z}[\sqrt{15}]$ a UFD?
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7
Suppose $p, p+2, p+4$ are prime numbers. Prove that $p = 3$ not using division algorithm.
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7
Is this $\gcd(0, 0) = 0$ a wrong belief in mathematics or it is true by convention?
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7
For which $d \in \mathbb{Z}$ is $\mathbb{Z}[\sqrt{d}]$ a unique factorization domain?
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7
Show that $\mathcal{O}_K$ is not UFD with $K = \mathbb{Q}(\sqrt{-13})$
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7
What is the norm of a number in a cubic integer ring?
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7
Find all primes of the form n^3+1
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