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Forum: FermatSearch 2021-11-29, 14:43
Replies: 341
Views: 82,245
Posted By Dr Sardonicus
Thanks for posting the news! From the Fermat...

Thanks for posting the news!

From the Fermat Search News page (http://www.fermatsearch.org/news.html):
Forum: Information & Answers 2021-11-29, 13:51
Replies: 16
Views: 928
Posted By Dr Sardonicus
Just to make the list a bit more exclusive, I...

Just to make the list a bit more exclusive, I told Pari-GP to look for primes p such that p + 2 and p + 18 were the next two consecutive primes. With the small limit I chose, it would have taken...
Forum: MattcAnderson 2021-11-29, 13:39
Replies: 1
Views: 41
Posted By Dr Sardonicus
It seems there is a sequence of "metallic ratios"...

It seems there is a sequence of "metallic ratios" or metallic means (https://everything.explained.today/Metallic_mean/), the nth being given by the simple continued fraction [n;n,n,n,n,...] which...
Forum: Miscellaneous Math 2021-11-29, 13:21
Replies: 429
Views: 39,645
Posted By Dr Sardonicus
If only you had found long beforehand the...

If only you had found long beforehand the "symbolic exponents" indicating the "hidden" Mersenne prime exponents from 1398269 to 82589933 were close by!

Think - just think! how far the work of...
Forum: And now for something completely different 2021-11-29, 02:30
Replies: 10
Views: 7,321
Posted By Dr Sardonicus
OK, number of digits in Mp, indicated blocks of...

OK, number of digits in Mp, indicated blocks of indicated number of decimal digits extracted from Mp which represent primes - or at least PRPs - looks right.

I suspect that all or most of the...
Forum: And now for something completely different 2021-11-28, 19:53
Replies: 10
Views: 7,321
Posted By Dr Sardonicus
The first two entries are n, p where p is the...

The first two entries are n, p where p is the exponent of the nth (known) Mersenne prime. I don't know what "MV," "SB," or "AH" signify.

I fed the expression (2^89/10^2)%10^21 to Pari-GP and got...
Forum: Lounge 2021-11-28, 16:10
Replies: 1,524
Views: 160,508
Posted By Dr Sardonicus
Well, sort of. The exact 1918 "Spanish flu"...

Well, sort of. The exact 1918 "Spanish flu" isn't circulating, but direct descendants certainly have been ever since. I became personally acquainted with one of them, the 1968 "Hong Kong flu."
...
Forum: Miscellaneous Math 2021-11-28, 15:34
Replies: 429
Views: 39,645
Posted By Dr Sardonicus
What might be interesting, or at least...

What might be interesting, or at least illustrative, would be to compare the actual amount of computing (GHz hours) required for the CERT compared to that for the PRP test. I can't compare elapsed...
Forum: Lounge 2021-11-28, 14:48
Replies: 1,524
Views: 160,508
Posted By Dr Sardonicus
This CNN story...

This CNN story (https://www.cnn.com/2021/11/28/health/us-coronavirus-sunday/index.html) has some interesting quotations.
Forum: Homework Help 2021-11-27, 15:16
Replies: 22
Views: 3,937
Posted By Dr Sardonicus
Clearly binomial(p-1,0) = 1 = (-1)^0, so it's...

Clearly binomial(p-1,0) = 1 = (-1)^0, so it's true for k = 0. Simplify the ratio binomial(p-1,k+1)/binomial(p-1,k) [you wind up with one linear term in the numerator and one in the denominator]. ...
Forum: Lounge 2021-11-27, 13:38
Replies: 1,808
RIP
Views: 188,719
Posted By Dr Sardonicus
Stephen Sondheim...

Stephen Sondheim (https://www.bbc.com/news/entertainment-arts-52125017)
Forum: Lounge 2021-11-27, 03:48
Replies: 1,524
Views: 160,508
Posted By Dr Sardonicus
Curiously, Africa heretofore seems to have had a...

Curiously, Africa heretofore seems to have had a fairly low incidence of COVID-19 despite low vaccination rates.

Now, a new variant shows up in southern Africa - and elsewhere.

Are people...
Forum: Lounge 2021-11-26, 19:10
Replies: 53
Views: 5,766
Posted By Dr Sardonicus
"Under a low grill?" Broil on low, perhaps? ...

"Under a low grill?" Broil on low, perhaps?

Do you mean Vade retro Satana ?
Forum: Lounge 2021-11-26, 18:47
Replies: 53
Views: 5,766
Posted By Dr Sardonicus
Southern Corn Pudding Based on the recipe in...

Southern Corn Pudding

Based on the recipe in my mom's old Fannie Farmer cookbook

You will need

A buttered casserole dish of 3-pint capacity, and a pan big enough to hold the casserole dish...
Forum: Lounge 2021-11-26, 15:50
Replies: 53
Views: 5,766
Posted By Dr Sardonicus
All I can figure is, you've never had the real...

All I can figure is, you've never had the real deal.

Make no mistake, I've eaten my share of the boxed or Velveeta-based travesties alternatives, and would do so again in a pinch. God help me, I...
Forum: Lounge 2021-11-26, 15:08
Replies: 53
Views: 5,766
Posted By Dr Sardonicus
Spaghetti sauce (and many other dishes) do seem...

Spaghetti sauce (and many other dishes) do seem better the next day. My mom said overnight refrigeration gave the flavors time to mingle, and I think she was right. It's also easy to remove excess...
Forum: Astronomy 2021-11-24, 21:05
Replies: 29
Views: 2,529
Posted By Dr Sardonicus
Thanks! I could probably watch videos of rockets...

Thanks! I could probably watch videos of rockets blowing up all day - as long as they didn't involve anyone getting injured or killed.

There was a story about about the Vanguard TV-3 failure -...
Forum: Astronomy 2021-11-24, 17:26
Replies: 29
Views: 2,529
Posted By Dr Sardonicus
Christmas! What could possibly go wrong?...

Christmas! What could possibly go wrong? (https://www.youtube.com/watch?v=g79K-R7xTFo) (YouTube video)
Forum: Lounge 2021-11-24, 13:32
Replies: 270
Views: 34,256
Posted By Dr Sardonicus
On Wednesday, November 24, 1971, a man going by...

On Wednesday, November 24, 1971, a man going by the name "Dan Cooper" AKA "D. B. Cooper" hijacked a flight from Portland to Seattle, ultimately parachuting from the 727 at 10,000 feet in a...
Forum: Astronomy 2021-11-24, 00:04
Replies: 29
Views: 2,529
Posted By Dr Sardonicus
Launch of new NASA space telescope delayed after...

Launch of new NASA space telescope delayed after incident (https://apnews.com/article/space-launches-space-exploration-science-business-europe-3952579f91e46b1d392f8ae40f0f18c1)
Forum: Marin's Mersenne-aries 2021-11-23, 13:56
Replies: 60
Views: 4,012
Posted By Dr Sardonicus
Oops. I really outdid myself that time! I meant...

Oops. I really outdid myself that time! I meant 2025.

:missingteeth: :missingteeth: :missingteeth: :missingteeth:
Forum: chalsall 2021-11-23, 02:26
Replies: 26
Views: 435
Posted By Dr Sardonicus
I don't know much about electrical grids or power...

I don't know much about electrical grids or power generation, but I have downloaded the 4 volumes. I started to read, but my eyes soon crossed and glazed over. Luckily, firejuggler, who evidently...
Forum: Marin's Mersenne-aries 2021-11-23, 01:58
Replies: 60
Views: 4,012
Posted By Dr Sardonicus
Check at Mersenne.org: That's 4505 exponents...

Check at Mersenne.org:

That's 4505 exponents in 21 days. At that rate, it would take about 1207 days to clear the remaining 258872 exponents, or around mid-March 2505 2025.

Of course, that...
Forum: Soap Box 2021-11-22, 21:21
Replies: 359
Views: 52,705
Posted By Dr Sardonicus
I got curious about whether the BBC...

I got curious about whether the BBC (https://www.bbc.com/news/uk-politics-59373237) might have left something out of an ITV reporter's question in its account:I looked elsewhere. The Daily Mail...
Forum: Lounge 2021-11-22, 18:52
Replies: 270
Views: 34,256
Posted By Dr Sardonicus
Friday, November 22, 1963 John Fitzgerald...

Friday, November 22, 1963

John Fitzgerald Kennedy, President of the United States, was assassinated.

EDIT: November 22 is also the Feast of Saint Cecilia. I don't know when or why November 22...
Showing results 1 to 25 of 1000

 
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