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joro
  • Member for 13 years, 2 months
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112 votes
25 answers
36k views

Examples of math hoaxes/interesting jokes published on April Fool's day?

78 votes
49 answers
43k views

Examples of interesting false proofs

44 votes
1 answer
17k views

Conjecturally unsafe RSA primes $p=27a^2+27a+7$

42 votes
3 answers
19k views

Which integers can be expressed as a sum of three cubes in infinitely many ways?

37 votes
12 answers
3k views

Interesting conjectures "discovered" by computers and proved by humans?

33 votes
4 answers
4k views

Can the difference of two distinct Fibonacci numbers be a square infinitely often?

25 votes
1 answer
2k views

Possible counterexample to a theorem assuming Lang's conjecture

20 votes
4 answers
985 views

Are there open problems for primes which are known for probable primes?

19 votes
1 answer
1k views

Is OEIS A007018 really a subsequence of squarefree numbers?

19 votes
4 answers
3k views

zeta(3) in terms of derivatives of zeta at 1/2 and pi

18 votes
1 answer
2k views

Conjecture: The number of points modulo $p$ of certain elliptic curve is $p$ or $p+2$ for $p$ of form $p=27a^2+27a+7$

16 votes
1 answer
687 views

A counterexample to a conjecture of Nash-Williams about hamiltonicity of digraphs?

15 votes
1 answer
2k views

Forbidden polynomial identities by the abc conjecture

15 votes
1 answer
1k views

Is deciding if one planar graph is dual to another really NP-hard (Wikipedia claim)?

14 votes
5 answers
1k views

Bounds for constructing $n!$ with additions, subtractions, and multiplications starting from $1$

14 votes
2 answers
3k views

Consequences of technically proving anything in Coq (on at least Linux) exploiting a bug? [closed]

14 votes
5 answers
970 views

Is the sequence $a_n=c a_{n-1} - a_{n-2}$ always composite for $n > 5$?

13 votes
0 answers
710 views

Is "OEIS A001935 Number of partitions with no even part repeated" efficiently computable $\mod 4$?

13 votes
1 answer
724 views

Infinitely many integer solutions to $X^4+Y^4-18Z^4= -16$

12 votes
3 answers
886 views

What CASes say about the analytic rank of rank 8 elliptic curve '457532830151317a1'

11 votes
1 answer
859 views

Up to $10^6$: $\sigma(8n+1) \mod 4 = OEIS A001935(n) \mod 4$ (Number of partitions with no even part repeated )

11 votes
1 answer
658 views

Can the sum of two non-zero coprime fifth powers be powerful?

11 votes
0 answers
1k views

Are the twin primes the only positive double zeros of this real function?

11 votes
3 answers
482 views

Finite objects for which isomorphism is NP-hard or harder?

10 votes
2 answers
2k views

When are the adjacency matrices of non-isomorphic graphs similar?

10 votes
1 answer
374 views

Reducibility of polynomials maps

10 votes
3 answers
3k views

Reduction from factoring to solving Pell equation

10 votes
3 answers
1k views

Why is the gcd so large in an identity related to the $abc$ conjecture?

10 votes
3 answers
657 views

Are all integers not congruent to 6 modulo 9 of the form $x^3+y^3+3z^2$?

9 votes
3 answers
522 views

Why mpmath computes $\sum_{n=2}^\infty (-1)^n\log(n)=\log\left(\frac1 2 \sqrt{2} \sqrt{\pi}\right)$

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