Welcome!
Welcome to /polymath/!
A polymath is a person who study various subject areas, the most notorious
example of this is probably Leonardo da Vinci. More info at Wikipedia:
https://en.wikipedia.org/wiki/Polymath
/polymath/ is a board dedicated to learning, sharing knowledge and
discussion.
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Support thread: >>17
Post here every time you visit this board: >>15
Nifty math trick
Nifty math discovery I did.
For integer X; Sum of 1 to X = (X*(X+1)/2). (Way old news)
Sum of integers from X to N. ((N-X)+1)*(X+N)/2. Also old news).
X=3; N=39; input values, ((39-3)+1)*(39+3)/2 = 777.
So I got curious, can I do this for ANY value?
Turns out you cannot. Only non-primes.
Prime numbers correspond to integer N+(N+1), which includes the set of all odd integers.
Let's say you want to find the continuous integer series that sum up to 666 or 777 or 888.
The formula is 1+((M-(P*(P+1)/2))/P).
M=Non-prime number.
P=Factors of M
For example, 777 factors to primes {3, 7, 37}, but we need the regular factor pairs of 777 = 3*259=7*111=21*37.
Now let's feed the formula.
1+((M-(P*(P+1)/2))/P)
1+((777−(3*(3+1)/2))/3)=258
777=258+259+260 {3 integers in the series}
Feed it again.
1+((777−(7*(7+1)/2))/7)=108
777=108+109+110+111+112+113+114
Divide by 7, get 7 integers in the series.
Feed it again.
1+((777−(21*(21+1)/2))/21)=27
777=27 + 28 + 29 + 30 + 31 + 32 + 33 + 34 + 35 + 36 + 37 + 38 + 39 + 40 + 41 + 42 + 43 + 44 + 45 + 46 + 47
Which has 21 integers which sum to 777.
1+((777−(37*(37+1)/2))/37)=3
777=3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43
Starts with 3 has 37 integers in the series.
1+((777−(111*(111+1)/2))/111)=-48
Oh noes... Oh wait, the 111 integers cancel each other out to zeroes. Easy trick, if you get negative results, FLIP THE SIGN THEN ADD +1. So -48 becomes 48 then +1=49.
Your next integer series begins at 49, and (111-49=62) so the series ends at 62.
777=49 + 50 + 51 + 52 + 53 + 54 + 55 + 56 + 57 + 58 + 59 + 60 + 61 + 62
And so on...
Note that no prime can be the sum of N+(N+1)+(N+2)+... (N+X), only the N+(N+1) value which includes all odd integers. A self-evident factor occurs because N+(N+2)+(N+3) is always divisible by 3. For 4 continuous integer series values, they likewise are divisible by 4 and so on. Ergo, no prime has divisors except itself and 1, so no N+(N+1)+(N+2)+... (N+X) integer summation series can sum to any prime number because it would be divisible evenly by some other number.
Cryptography - Who can find the meaning of this web page?
A French electronic technician making videos on youtube has also created a website with a page that will contain a code that only insiders can read...
You don't choose to become an insider, you are chosen.
According to the author this code has nothing to do with freemasons.
The community of electronics enthusiasts is trying to solve this code without succeeding.
Do cryptography experts or enthusiasts have an idea of what its symbols mean?
Thanks guys ;)
Youtube channel: https://www.youtube.com/c/PhilippeDemerliac_Cyrob/about
Website: http://cyrob.org/
The web page with the code to be decoded: http://philippe.demerliac.free.fr/PQNVEQMLT.htm
A message from the electronics engineer: "And then you can ask for help from whomever you want - it's useless and nobody will find anything. This means of expression has existed for thousands of years and no uninitiated person has ever understood it and will never understand it, it is inherent to its very nature. And to cut all questions short, you don't choose to be part of this community or not, if you can call it that, you are in it or not and it's not chosen. Believe me, I wish I had that choice...."
Education suggestions
I managed to get my niece interested in nasa
and I need help to see any good books or materials to help her out especially since today is the moon landing
addendum;
science cult ideas
science cult ideas
Mayor- Anyone who can successfully build a sustainable settlement from scratch
Orator- anyone who can successfully teach how to read and write their native language to an immigrant
bonus points if you can build a printing press
Medic- I dont know what a good goalpost would be I guess being able to perform HABC first aid?
Craftsman - I suggest the ability to use bend glass wood and metal, clay if you feeling generous
priest/fireman -the ability to tell 10 fairy tales from memory
Traveler - someone who can sail .fly a plane and ride on horseback
any ideas for sciency bragging rigths titles?
