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 Showing results 1 to 25 of 1000 Search took 0.27 seconds. Search: Posts Made By: Dr Sardonicus
 Forum: Lounge 2021-09-26, 01:55 Replies: 1,701 Views: 134,817 Posted By Dr Sardonicus Googling turned up some neat images of the storm,... Googling turned up some neat images of the storm, and a number of news stories. This NPR story (https://www.npr.org/2021/09/25/1040692676/sam-is-now-a-major-hurricane-but-isnt-likely-to-hit-land)...
 2021-09-26, 01:25 Replies: 24 Views: 7,425 Posted By Dr Sardonicus With a = 33*2^2939064 - 5606879602425*2^1290000 -... With a = 33*2^2939064 - 5606879602425*2^1290000 - 1 and d = 33*2^2939063 - 5606879602425*2^1290000, a == 2 (mod 5) and d == 4 (mod 5), so a + 2*d is divisible by 5. Thus a, a + d, a + 2d is not a...
 2021-09-25, 16:48 Replies: 24 Views: 7,425 Posted By Dr Sardonicus Actually, you may have done better than you... Actually, you may have done better than you realize. If a = 33*2^2939064 - 5606879602425*2^1290000 - 1 and d = 33*2^2939063 - 5606879602425*2^1290000, then a - d = 33*2^2939063 - 1. Just out...
 Forum: Tales From the Crypt(o) 2021-09-25, 13:30 Replies: 285 Views: 90,121 Posted By Dr Sardonicus And it's time to play "LET'S MAKE A DEAL!" [/quote]Canadians released after Huawei CFO resolves US charges (https://apnews.com/article/technology-business-new-york-courts-brooklyn-dc957e575f896375d14c08a456af14ea)
 Forum: Information & Answers 2021-09-25, 03:05 Replies: 54 Views: 6,964 Posted By Dr Sardonicus You're free to waste your own time and money... You're free to waste your own time and money chasing after your ever-changing will-o'-the-wisps. Don't expect others to waste theirs.
 2021-09-24, 19:30 Replies: 24 Views: 7,425 Posted By Dr Sardonicus Quite understandable! Perhaps you are in need of... Quite understandable! Perhaps you are in need of sedation... :beer2: :beer2: :beer2: :beer2: :beer2: :beer2: :beer2: :beer2:
 2021-09-24, 16:43 Replies: 24 Views: 7,425 Posted By Dr Sardonicus Congratulations, looks like you've found a huge... Congratulations, looks like you've found a huge 3-term AP of primes! I'm a bit confused by your usage "new top." [Chekov voice]The top of what?[/Chekov voice] I'm inferring the meaning...
 Forum: Information & Answers 2021-09-24, 14:10 Replies: 54 Views: 6,964 Posted By Dr Sardonicus "Certified semi-prime?" What the heck is that... "Certified semi-prime?" What the heck is that supposed to mean? AFAIK the only way to "certify" a number N >= M1277 known to be composite, is a P2, is to factor it. In theory, it is possible, if...
 Forum: Soap Box 2021-09-24, 12:45 Replies: 128 Views: 14,655 Posted By Dr Sardonicus IMO it would be much more "convenient" for people... IMO it would be much more "convenient" for people who want to grow crops such as rice or cotton; or to have green lawns, lush gardens, and swimming pools, to find somewhere to live other than in the...
 Forum: Soap Box 2021-09-24, 00:36 Replies: 128 Views: 14,655 Posted By Dr Sardonicus There is a series of web pages about the Aral Sea... There is a series of web pages about the Aral Sea starting here (http://www.columbia.edu/~tmt2120/introduction.htm).
 Forum: MattcAnderson 2021-09-23, 15:46 Replies: 8 Views: 514 Posted By Dr Sardonicus according to the Bateman-Horn conjecture, the... according to the Bateman-Horn conjecture, the number of n less than or equal to X for which n2 + n + 41 is prime is asymptotically c*Li(X) for a positive constant c; this is asymptotically c*X/ln(X)....
 Forum: Soap Box 2021-09-23, 15:17 Replies: 128 Views: 14,655 Posted By Dr Sardonicus I find the sentence to be very awkward. I... I find the sentence to be very awkward. I imagine it means something like, "If human population numbers get high enough, there won't be enough water to go around." This is quite unlikely to be...
 Forum: Science & Technology 2021-09-23, 12:49 Replies: 80 Views: 16,937 Posted By Dr Sardonicus By name, at least. Sounds like at least one of... By name, at least. Sounds like at least one of them may no longer be recognizable by sight :sad:
 Forum: Prime Gap Searches 2021-09-23, 12:35 Replies: 60 Views: 5,431 Posted By Dr Sardonicus I don't know about the approach in its entirety,... I don't know about the approach in its entirety, but I can confirm the congruence. If 2n-1 == 1 (mod n), and p is a prime for which p|n, then 2n-1 == 1 (mod p). Consequently, if m is the least...
 Forum: Lounge 2021-09-22, 17:01 Replies: 1,473 Views: 150,061 Posted By Dr Sardonicus If someone takes ivermectin to prevent COVID,... If someone takes ivermectin to prevent COVID, presumably they don't have COVID. You can't die of an illness you don't have. Cause of death would be ivermectin poisoning, manner of death accidental....
 Forum: Lounge 2021-09-22, 15:55 Replies: 1,473 Views: 150,061 Posted By Dr Sardonicus IOW, ivermectin is an effective preventive... IOW, ivermectin is an effective preventive against COVID if you take enough to kill you.
 Forum: Dobri 2021-09-22, 11:41 Replies: 50 Views: 1,581 Posted By Dr Sardonicus 2. 5 points for every statement that is clearly... 2. 5 points for every statement that is clearly vacuous, logically inconsistent, or widely agreed on to be false. 3. 10 points for each such statement that is adhered to despite careful correction....
 Forum: Lounge 2021-09-22, 02:42 Replies: 1,473 Views: 150,061 Posted By Dr Sardonicus (Sung to the tune of "My Darling Clementine") ... (Sung to the tune of "My Darling Clementine") Here's a fable of a stable And a stallion young and strong, Who did badly, because sadly, I could not cure what was wrong. CHORUS: Ivermectin,...
 2021-09-21, 20:25 Replies: 13 Views: 368 Posted By Dr Sardonicus That is a nice way of looking at it. I actually... That is a nice way of looking at it. I actually test for divisibility by 11 in my head this way sometimes. An alternate approach is as follows: To any integer base b >1, a base-b palindrome N...
 Forum: Lounge 2021-09-21, 19:16 Replies: 1,473 Views: 150,061 Posted By Dr Sardonicus Considerable stock, eh? Judging by what's... Considerable stock, eh? Judging by what's happened with Plaquenil, that will change. People already prescribed Plaquenil (hydroxychloroquine) for lupus or rheumatoid arthritis are finding it...
 Forum: Science & Technology 2021-09-21, 16:39 Replies: 80 Views: 16,937 Posted By Dr Sardonicus So, "seeing" is bad due to a case of Spanish... So, "seeing" is bad due to a case of Spanish flue...
 Forum: Wagstaff PRP Search 2021-09-21, 13:34 Replies: 5 Views: 5,432 Posted By Dr Sardonicus There is no such thing as "the rationals mod q." ... There is no such thing as "the rationals mod q." The rational number 1/q is not defined "mod q." The residue ring Z/qZ of the integers mod q is a field, the finite field Fq of q elements. In the...
 Forum: Information & Answers 2021-09-21, 12:38 Replies: 5 Views: 366 Posted By Dr Sardonicus (More details may be found in various threads on... (More details may be found in various threads on this Forum, and at the GIMPS home page (https://www.mersenne.org/).) At present, the smallest Mersenne number which is known to be composite, but...
 Forum: Miscellaneous Math 2021-09-20, 13:27 Replies: 9 Views: 342 Posted By Dr Sardonicus Instead of just hoping to "be lucky," it would be... Instead of just hoping to "be lucky," it would be a good idea to at least try to check your formulas for divisibility by small primes. Your formula is N = 2*(10^X - 1)/9 + 7*10^X + 5 This...
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