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zakruti.com » Knowledge, science, education » Numberphile
78557 and Proth Primes - Numberphile

78557 and Proth Primes - Numberphile

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Rating: 4.0; Vote: 1
78557 and Proth Primes Promit: Great video as always. BTW, I can't figure out this problem. Finally posting this on a mathematically inclined group as no one on the Internet seems to be willing to answer this. Actually I'm appearing for an important test and it would be very helpful for me to know some facts. Based on current performance analysis on mock tests, my guesses are likely to be correct 50 percent of the times(ie, 50 percent chance of getting an Mcq correct or 50 percent accuracy) in a 4 option multiple choice question exam (mcq type exam) of total 300 questions, with 4 marks awarded for a correct answer and 1 mark deducted for every wrong answer. This 50 percent accuracy is for the 1st 250 questions I attempt which I tend to get right in the above mentioned percentage. For the next 50 however, upon guessing I would be right no more than a random chance of 25 percent. Then what is the optimum number of questions I should attempt to get the maximum marks, while getting the minimum negative marks? And what would that value be for a range of 40 to 60 percent accuracy for the first 250 questions? I apologise if my question seems too complicated, as I myself am flummoxed by it. Would it be best to answer all, as the marking scheme seems to favour guessing? Thanks in advance for indulging in the cerebral effort.
Date: 2022-04-08

Comments and reviews: 9


I've always been amazed that prime numbers can be that big. As numbers get bigger, isn't it less and less likely they will be a prime, because there are more and more numbers before then that they could be divisible by? Shouldn't you get to a point where numbers are so big there aren't any primes anymore, because there's too many numbers that come before themb it's almost a certainty that the number you're looking at will be divisible by one of them? Like if you just took two random numbers, couldn't you say it's more likely the smaller one will be a prime than the bigger one, because there are just more numbers that come before and more chances of being divisible by one of them?
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There are two fields electric and magnetic which spin orthogonally with lines of masses created out of this fields. Some primes create matter and others anti matter. Usually smaller and smaller primes interaction are dark matter. Interaction between smaller and larger primes are just ripples and energy transfer and expansion and spins. The interaction between larger primes are matter sun and stars and galaxies. Larger twin primes are always stars. Interaction of larger distant primes are always atoms and elements and chemical reactions. Galaxies are extremely large twin primes.
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Request or suggestion: Hi. please do something on AVERAGE SPEEDS, like where we can replace (two different) speed(s) by average speed etc. like 'Every day a person walks at a constant speed, V1 for 30 minutes. On a particular day, after walking for 10 minutes at V1, he rested for 5 minutes. He finished the remaining distance of his regular walk at a constant speed, V2, in another 30 minutes. On that day, find the ratio of V2 and his average speed (i. e, total distance covered /total time taken including resting time)'. and guess what, it is 1: 1. Plz do something like this please.
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sir I have a question and please answer it, sir as we seen that (1+2+3+4)=-1/12 gives a negative number then does it will also true for if we add negative numbers and will get apositive number as (-1-2-3-4-5-6)=1/12 by using the math as. .-(1+2+3)=1/12. sir by these results what we can conclude, our mathematical calculation is wrong, or maths is giving a wrong answer, but math cannot give a wrong answer if we have performed it as we do usual then what is the reason behind this we are getting such a absurd result, doex these results are challinging us that we are wrong
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Huh i haven't seen a video about Pi for a long time. here is a question i asked myself, but i'm not mathematician enough to answer it myself:
if you add / substract / add / substract etc. all digits of pi. what whill happen?
e. g. 3. 14159265359. = 3-1+4-1+5-9+2-6+5-3+5-9. right now its -5. But in theory. would it be possible to go up to infinty? or to negative infinity? after all, would it converge to 0, because after all, digits are kind of equally distributet? is there any way to get any sort of answer? may some fellow mathematician try to answer?

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Hey in my math class we got a problem where you had to find the area of a shaded area in a triangle. It is Geometry so it's fairly simple and the area of the Shaded triangle is also a trapezoid if you solve it by finding the area of the whole triangle and subtracting the area of the smaller triangle on top it comes out with a different answer than if you just find the area the trapezoid our teacher can't figure out why and I was wondering if I sent this to you you guys could explain why this was the way it was
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Why not the significance of primes in music intervals, and how changing the hertz in its relation within primes can find other iterations of harmony, of course not every marriage is complete, within this thought, there would be stepping stones between, but basing the freq. in bases of differing primes rather than just the fifths, allows for a broader depth of musical scoring. Which would be. something interesting. but I suppose in some regard that is done, by other means, but not to scale. Hmmm Thoughts.
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I have a question concerning their testing method. You can test if one of these numbers is a prime, but not if it isn't. I mean at what power to you say -Ok, this is probably isn't a prime-? Even then, it doesn't prove that they do not have a prime number. Perhaps its just taken to a power higher than what was previously tested. I'd love to hear an answer! :)
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I just learned about the Catalan number in discrete math class and this thing is AMAZING! It describes so many different problems. I know it is not related to primes, but I'd love to watch Dr Grimes or Matt Parker (or anyone else as a matter of fact) explaining it!
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