4 ms·

Adding up digits doesn't tell you if a number is prime. You need to factorize it in order to know that for sure, and for that you need to try all suitable facto

Adding up digits doesn't tell you if a number is prime. You need to factorize it in order to know that for sure, and for that you need to try all suitable factors by hand or use an elimination algorithm like the sieve of Eratosthenes, which would quickly become too unwieldly for large numbers though. I don't recall the prime number counting from the books. I think they just included it in the show to convey that Dornick is a math genius, as reciting large primes like she does is incredibly hard.

jelliclesfarm 5y ago
I realize that adding up numbers doesn’t tell you if it’s a prime…I liked counting primes to quell anxiety but i couldn’t after the numbers got large. So I would just add random numbers to manageable digits and stick to simple prime numbers checks.(sorry..I can’t articulate…it was just something I did on the road because I hated driving) Thanks re: book Vs series Dornick. I am trying to get into it. I just finished episode 3. I have mixed feelings about the series so far. I don’t think I can go back and re read Foundation series. I won’t even know which order to read it in… Not spoiler alert but small detail reveal : . . . . . In episode 2, there is a bit where Dornick counts primes and utters an even number..corrects herself and realizes that ‘something is wrong’. They make it look like it was pregnant with some kind of meaning. The whole thing was just odd, but it made me wonder if I missed something or if I forgot the book plot.
- Jtsummers 5y ago
  Something that's developing (based on how it's played out so far) is that some of the characters, perhaps due to their fundamental math ability or their math ability is derived from it, seem to have strong and accurate intuitions. That even number was, in my interpretation, caused by something connecting in her subconscious (describing what would be a spoiler, so rot-13'd): Zl gubhtug vf gung gur rneyvre jnl gung Enlpur naq Fryqba jrer nethvat ng gur zrny jnf tanjvat ng ure. Fur unq n ernyvmngvba gung fbzrguvat onq jnf tbvat gb unccra orgjrra gur gjb zra. N fvzvyne qvfcynl bs vaghvgvba, vs abg zragnyvpf (nf Nfvzbi grezrq vg), cynlf bhg yngre ba va gur frnfba jvgu nabgure punenpgre. All that said, the series has diverged rather strongly from the books in some areas, principally characterizations. Some people have been changed substantially. I wouldn't expect any character to match the book version one-to-one.
  - jelliclesfarm 5y ago
    Indeed. That’s disappointing. If it’s not The Foundation series anymore, why call it that?
    - linkdd 5y ago
      Asimov stated himself that the story would need to be changed if a movie/serie adaptation was to be made. This is still the story of the foundation to reduce 30,000 years of chaos to only 1,000. After all, psychohistory was never about individuals. The changes made to some characters do not harm the story IMHO. It is still very enjoyable. The background is still there.

jelliclesfarm 5y ago

I realize that adding up numbers doesn’t tell you if it’s a prime…I liked counting primes to quell anxiety but i couldn’t after the numbers got large. So I would just add random numbers to manageable digits and stick to simple prime numbers checks.(sorry..I can’t articulate…it was just something I did on the road because I hated driving) Thanks re: book Vs series Dornick. I am trying to get into it. I just finished episode 3. I have mixed feelings about the series so far. I don’t think I can go back and re read Foundation series. I won’t even know which order to read it in… Not spoiler alert but small detail reveal : . . . . . In episode 2, there is a bit where Dornick counts primes and utters an even number..corrects herself and realizes that ‘something is wrong’. They make it look like it was pregnant with some kind of meaning. The whole thing was just odd, but it made me wonder if I missed something or if I forgot the book plot.

Jtsummers 5y ago
Something that's developing (based on how it's played out so far) is that some of the characters, perhaps due to their fundamental math ability or their math ability is derived from it, seem to have strong and accurate intuitions. That even number was, in my interpretation, caused by something connecting in her subconscious (describing what would be a spoiler, so rot-13'd): Zl gubhtug vf gung gur rneyvre jnl gung Enlpur naq Fryqba jrer nethvat ng gur zrny jnf tanjvat ng ure. Fur unq n ernyvmngvba gung fbzrguvat onq jnf tbvat gb unccra orgjrra gur gjb zra. N fvzvyne qvfcynl bs vaghvgvba, vs abg zragnyvpf (nf Nfvzbi grezrq vg), cynlf bhg yngre ba va gur frnfba jvgu nabgure punenpgre. All that said, the series has diverged rather strongly from the books in some areas, principally characterizations. Some people have been changed substantially. I wouldn't expect any character to match the book version one-to-one.
- jelliclesfarm 5y ago
  Indeed. That’s disappointing. If it’s not The Foundation series anymore, why call it that?
  - linkdd 5y ago
    Asimov stated himself that the story would need to be changed if a movie/serie adaptation was to be made. This is still the story of the foundation to reduce 30,000 years of chaos to only 1,000. After all, psychohistory was never about individuals. The changes made to some characters do not harm the story IMHO. It is still very enjoyable. The background is still there.