Sieve of Eratosthenes, UCLA

[AarhusSurell]

what the heck am i doing here ..

[roxypen]

I get it!

[interestingramble]

(p1+p2)+(p1Xp2) = prime. If p <=7or n <=8 Sometimes I can take a group of 3,4 primes and do the same thing like (p1+p2+p3+p4)+(p1Xp2Xp3Xp4)=pr­ime

2,3,5,7 (Primes)

(2+3)+(2X3)=11

(5,7) = 47 Y

Cluster (2,3,5,7)=227 Y

Cluster (2,3)=11 Y Cont... (2,5)=17; (2,3)=11; (2,7)=23; (3,5)=23; (3,7)=31; (5,7)=47

Cluster (2,3,5)=47

1-8 in counting pairs also generates primes from pairs only in counting order with this.

(1,2)=7;(3,4)=19;(5,6)=41;(7,8­)=71

[buzz0763]

nice!

its interesting to see that there is a visual pattern here as well. so for a machine that isn't optimized for numeric calculations (eg: me) , its still possible to find the primes using the visual process. Of course, one would have to discover more complex visual patterns to eliminate the multiples of larger primes.

[freetothinkify]

If you go 2+3=5, 2+3+2=7,2+3+2+2=9 etc. If you increase by 2s after 2+3 =5, basically, you hit all of the primes. They skip around, with the first gap of (4) happening from 89 to 97. I'm too tired to do anymore tonight, but I agree that they all can be broken down into one 3 and a certain number of 2s, increasing by 2. I guess you could say that that's because they're all odd, and 1 hits them all as well.

[bw1024]

Errr 9 is not a prime number...

[NationalBank722]

Err 9 is a multiple of 3...

[notfarfromhome]

Pretty cool!