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Search: Posts Made By: Dr Sardonicus
Forum: Puzzles 2020-10-23, 19:07
Replies: 19
Views: 258
Posted By Dr Sardonicus
Hmm. Looking at it now, I guess it is. Never...

Hmm. Looking at it now, I guess it is. Never occurred to me before. Fascinating. So, that's a helmet on the head.

So the figure is wearing a helmet and holding a torch. Interesting...
Forum: Number Theory Discussion Group 2020-10-23, 18:46
Replies: 18
Views: 343
Posted By Dr Sardonicus
There is an "admissibility condition" to the...

There is an "admissibility condition" to the effect that there can be no inevitable prime factor.

To check this, I told Pari-GP to compute the degree-447 polynomial

f =...
Forum: Puzzles 2020-10-23, 13:18
Replies: 19
Views: 258
Posted By Dr Sardonicus
The oil lamp may also symbolize learning or...

The oil lamp may also symbolize learning or education.

The lightning bolt may symbolize sudden realization, or sudden banishment of ignorance.

Balance scales -- justice, equality, etc as...
Forum: Number Theory Discussion Group 2020-10-23, 12:37
Replies: 18
Views: 343
Posted By Dr Sardonicus
Question Sequence of 3159 numbers containing 447 primes

By 53#? I don't know where in the world you got that idea.
Forum: ONeil 2020-10-23, 12:28
Replies: 26
Views: 318
Posted By Dr Sardonicus
Respective k<6*p+1 when p=1 (mod 4)[/QUOTE] ...

Respective k<6*p+1 when p=1 (mod 4)[/QUOTE]
:tu:
Forum: ONeil 2020-10-23, 11:56
Replies: 26
Views: 318
Posted By Dr Sardonicus
This works with only k=1, thus if it divides...

This works with only k=1, thus if it divides 2p-1, it is definitely a prime factor.[/QUOTE]Actually, it's true for more than just k = 1.

Let p > 2 be prime. The smallest conceivable composite...
Forum: Number Theory Discussion Group 2020-10-23, 00:26
Replies: 18
Views: 343
Posted By Dr Sardonicus
Once upon a time, long long ago, I posted a link...

Once upon a time, long long ago, I posted a link to a paper discussing this, Prime Number Races (https://dms.umontreal.ca/~andrew/PDF/PrimeRace.pdf).
Forum: Puzzles 2020-10-22, 23:49
Replies: 19
Views: 258
Posted By Dr Sardonicus
Starting at the upper left, and proceeding...

Starting at the upper left, and proceeding clockwise around the perimeter, there are a number of objects with possibly symbolic meanings.

An oil lamp.
Lightning bolt (?)
Scales
Shield...
Forum: Science & Technology 2020-10-22, 16:41
Replies: 30
Views: 1,823
Posted By Dr Sardonicus
Unfortunately, the previous poster failed to...

Unfortunately, the previous poster failed to emphasize the main problem:

It seems that drifting is the snow issue. The old station was buried under so much snow, it was ordered sealed because...
Forum: Lounge 2020-10-22, 16:10
Replies: 1,508
RIP
Views: 102,533
Posted By Dr Sardonicus
Harry Houdini and Sherlock Holmes creator Arthur...

Harry Houdini and Sherlock Holmes creator Arthur Conan Doyle became friends, but Doyle was a Spiritualist, and their friendship ended over Houdini's campaign against phony Spiritualist mediums.
...
Forum: Number Theory Discussion Group 2020-10-22, 15:34
Replies: 18
Views: 343
Posted By Dr Sardonicus
K-TUPLE Permissible Patterns...

K-TUPLE Permissible Patterns (http://www.opertech.com/primes/k-tuples.html)
Forum: Lounge 2020-10-22, 15:01
Replies: 1,508
RIP
Views: 102,533
Posted By Dr Sardonicus
Would a fraudster setting up a GoFundMe page for...

Would a fraudster setting up a GoFundMe page for his funeral expenses do?
Forum: Lounge 2020-10-22, 12:45
Replies: 1,311
Views: 71,209
Posted By Dr Sardonicus
<snip>[/QUOTE]Perhaps he hasn't tried fermented...

<snip>[/QUOTE]Perhaps he hasn't tried fermented Greenland shark, Kæster Hákarl (https://allthatsinteresting.com/hakarl)

This delicacy was brought to my attention by a cook book I received as a...
Forum: Puzzles 2020-10-22, 11:37
Replies: 6
Views: 179
Posted By Dr Sardonicus
Yes, substituting x for 7! does make things much...

Yes, substituting x for 7! does make things much easier to handle. The obvious regrouping of the first part of the expression gives
...
Forum: jwaltos 2020-10-22, 11:15
Replies: 2
Views: 73
Posted By Dr Sardonicus
According to the Mathematics Genealogy Project...

According to the Mathematics Genealogy Project (https://www.genealogy.math.ndsu.nodak.edu/id.php?id=69767), André Néron got his Ph.D. in 1952, and the title of his thesis is Problèmes arithmétique et...
Forum: Soap Box 2020-10-22, 00:09
Replies: 1,339
Views: 57,671
Posted By Dr Sardonicus
I will consider myself fortunate if this doesn't...

I will consider myself fortunate if this doesn't give me a fatal case of the dry heaves.[/QUOTE]Trump rape accuser 'stunned' at DOJ no-show at court hearing...
Forum: Soap Box 2020-10-21, 13:40
Replies: 338
Views: 19,676
Posted By Dr Sardonicus
[/QUOTE]Reminds me of an SF story, Something in...

[/QUOTE]Reminds me of an SF story, Something in the City (Novelette, author Colin Kapp, got the cover illustration of the November 1984 ANALOG).
Forum: Lounge 2020-10-21, 12:26
Replies: 72
Views: 1,736
Posted By Dr Sardonicus
Avocados can be poisonous to horses. Nasty stuff....

Avocados can be poisonous to horses. Nasty stuff.

https://ker.com/equinews/avocados-can-toxic-horses/[/QUOTE]Based on the xkcd "What if?..." A mole of moles (https://what-if.xkcd.com/4/), we have...
Forum: Lounge 2020-10-20, 14:30
Replies: 72
Views: 1,736
Posted By Dr Sardonicus
The (approximate) molecular weight of the...

The (approximate) molecular weight of the asphyxiant CO is 12 + 16 = 28, which is the same as the 14 + 14 of N2, which is by far the largest component of air. (The next-largest is oxygen, with a...
Forum: Lounge 2020-10-19, 23:27
Replies: 1,124
Views: 53,226
Posted By Dr Sardonicus
Speaking of ready-made scapegoats...

From a Monday call to campaign staff -- knowing members of the press were on the line -- as quoted, e.g. here...
Forum: Lounge 2020-10-19, 19:20
Replies: 128
Views: 10,897
Posted By Dr Sardonicus
Owl boards helicopter fighting California...

Owl boards helicopter fighting California wildfire (https://www.upi.com/Odd_News/2020/10/16/Owl-boards-helicopter-fighting-California-wildfire/9711602880111/)
...
Forum: Lounge 2020-10-19, 19:08
Replies: 1,311
Views: 71,209
Posted By Dr Sardonicus
I have no objection to eating roadkill. I was...

I have no objection to eating roadkill. I was merely pointing out that "road mortality" wasn't all that eco-friendly.

There is one caveat, at least here in the US. Some states require that, if...
Forum: Lounge 2020-10-19, 14:16
Replies: 1,311
Views: 71,209
Posted By Dr Sardonicus
I wouldn't be so sure of that. According to,...

I wouldn't be so sure of that. According to, e.g. the 2004 article about how roads affect the ecology, The Ecology of Roadkill (https://www.discovermagazine.com/environment/the-ecology-of-roadkill)...
Forum: Lounge 2020-10-19, 11:36
Replies: 1,124
Views: 53,226
Posted By Dr Sardonicus
I don't see why. The folks here seem to have...

I don't see why. The folks here seem to have zeroed in on the fact that the Great Barrington Declaration "proposes" a facile phrase -- "focused protection" -- without any real idea of how to carry...
Forum: Lounge 2020-10-19, 01:31
Replies: 1,124
Views: 53,226
Posted By Dr Sardonicus
The Great Barrington Declaration...

The Great Barrington Declaration (https://gbdeclaration.org/)
Showing results 1 to 25 of 1000

 
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