Math moran question

4 + 7 = 11 not 12

Thanks.. I had a feeling I was dealing with an error

Hmm is it direct um moran question um ok direct response

I can’t lie, I have to get all my fingers and toes involved for most things involving numbers :)

But it makes me wonder if I'm onto something nonetheless. Perhaps adding 1 on the second step will yield the same results for this and other number combinations.

I have fun with this kind of thing.

20+ years ago I calculated prime numbers in my head with simple math while trying to fall asleep. After I got into the 30,000's I jumped up to check wether or not the last number was indeed prime. Sure enough it was.

I started trying to program the algorithm but I wasn't good enough at programming then.

Last month I wrote the program from what I could remember. It works. Does it generate *all* prime numbers.. not sure, but definitely *all* prime numbers in the lower ranges.

You ever count to 21?

Only when I’m alone

If interested, the basis for my prime number generator is simply:

0 + 1 = 1 (technically prime)
1 + 1 = 2 (the only even prime)
2 + 1 = 3 (prime)
3 + 2 = 5 (prime)
5 + 2 = 7 (prime)
7 + 5 = 13 (prime) But skips 11, so..
13 - 2 = 11 (prime)

There's more to it, but that's what got me going on it. The algorithm I made in my head 20+ years ago skipped whole ranges of primes. And possibly the one I created a month ago does too.

Fun with numbers either way.

.

this is just how math works the way we’ve constructed our proofs

your line of thinking was done 1000 years ago, by the ancients

will you be nasa spending billions on a pen, or russia using a pencil?

not really a generator if you state the output and not the algo

wouldn’t the next sequence be 13+7=20? or 13+5=18?

Why is it a mathematician and not mathsematician?

2 + 2 = 4
4 + 7 = 11
11 + 4 = 15

fixed it for you

Yes but,

11 + 4 = the 15

Yep, you're onto something all right...something that looks like Common Core math...fucking stupid and the long arsed way of doing shit.

Last Edited by Swearbox on 08/30/2022 06:22 PM

is Jenny's number a prime?

8675309

I handle that with simple addition or subtraction of 1. In this case, both are prime 17 & 19.

Here's the output from my generator with 100 cycles using 0 through 100 as input:

[
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37,
41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89,
97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223,
227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359,
367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433,
439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
509, 521, 523, 541,
... 188 more items
]

Here, with 1,000,000,000,000 through 1,000,000,000,100 as input:

Time to generate primes with 1000000000000 and 1000000000100: 71.849ms
[
1000000000039,
1000000000061,
1000000000063,
1000000000091,
2000000000137,
2000000000179,
3000000000187,
4000000000361
]

Last Edited by BoatyMcBoatface on 08/31/2022 09:09 AM

Yes.

> pryme 8675309
default: 0.229ms
8675309 is prime? true

Last Edited by BoatyMcBoatface on 08/31/2022 08:56 AM

sweet!