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 Showing results 1 to 25 of 1000 Search took 0.35 seconds. Search: Posts Made By: Dr Sardonicus
 Forum: Lounge 2021-11-29, 20:17 Replies: 1,527 Views: 160,636 Posted By Dr Sardonicus This line of discussion may bear on the disparity... This line of discussion may bear on the disparity in case-fatality ratios in different countries. I'm not willing to chalk it all up to variations in detection and the reporting process. One...
 Forum: Information & Answers 2021-11-29, 19:52 Replies: 17 Views: 977 Posted By Dr Sardonicus In the spirit of "20 is an arbitrary parameter,"... In the spirit of "20 is an arbitrary parameter," the following mindless script looks for a triple p, p + 2, p + k which are consecutive primes, for even integers k > 2 which are not congruent to 1...
 Forum: Homework Help 2021-11-29, 16:05 Replies: 23 Views: 3,976 Posted By Dr Sardonicus Of course! And for 0 < k < p,... Of course! And for 0 < k < p, \frac{p!}{k!(p-k)!} clearly is divisible by p because the denominator is composed of factors less than p. The result can be extended slightly. Since p divides...
 Forum: FermatSearch 2021-11-29, 14:43 Replies: 344 Sticky: New Fermat factors Views: 82,356 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: 17 Views: 977 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: 2 Views: 78 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: 39,731 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...
 2021-11-29, 02:30 Replies: 10 Views: 7,344 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...
 2021-11-28, 19:53 Replies: 10 Views: 7,344 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: 1,527 Views: 160,636 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: 39,731 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: 1,527 Views: 160,636 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: 23 Views: 3,976 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 Views: 188,784 Posted By Dr Sardonicus Stephen Sondheim... Stephen Sondheim (https://www.bbc.com/news/entertainment-arts-52125017)
 Forum: Lounge 2021-11-27, 03:48 Replies: 1,527 Views: 160,636 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: 5,777 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: 5,777 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: 5,777 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: 5,777 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: 2,540 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: 2,540 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: 34,270 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: 2,540 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: 4,016 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: 436 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...
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