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Search: Posts Made By: MattcAnderson
Forum: Astronomy 2021-10-20, 18:17
Replies: 0
Views: 4
Posted By MattcAnderson
A new rocket launch to study Trojan Asteroids near Jupiter

Hi all,

The October 16, 2021 marked the launch of a rocket nicknamed "Lucy" after the 3.5 Million year old skeleton found in Ethiopia and the Beatles song "Lucy in the Sky with Diamonds".

This...
Forum: MattcAnderson 2021-10-20, 05:11
Replies: 24
Views: 483
Posted By MattcAnderson
Hi all, From before, According to...

Hi all,

From before,

According to Wikipedia (constructible polygon article), there are infinitely many constructible polygons, but only 31 with an odd number of sides are known.

5 Fermat...
Forum: MattcAnderson 2021-10-19, 02:33
Replies: 4
Views: 260
Posted By MattcAnderson
Hi all, Thank you for your interest Kuratkull. ...

Hi all, Thank you for your interest Kuratkull.

Most of the prime lists I found were at least an overnight calculation.

I used the isprime() function in Maple and it is quite slow. But easy...
Forum: Lounge 2021-10-19, 01:59
Replies: 1,732
Views: 93,309
Posted By MattcAnderson
rings Real Ice Never Gets Sticky never

rings

Real Ice Never Gets Sticky

never
Forum: MattcAnderson 2021-10-18, 18:38
Replies: 4
Views: 260
Posted By MattcAnderson
Hi all, I found a webpage with a nice...

Hi all,

I found a webpage with a nice definition of Prime constellations. Especially I like that they specified no repetitions and some prime numbers can be skipped if it is a prime cluster.
...
Forum: MattcAnderson 2021-10-18, 17:14
Replies: 24
Views: 483
Posted By MattcAnderson
Hi all, You are correct Retina. The Binary...

Hi all,

You are correct Retina. The Binary counting from 00000 to 11111 and subtract the 0 case is an easy way to see that 31 is the right answer. 1+2+4+8+16 = 31. Thanks for that.

Regards,...
Forum: MattcAnderson 2021-10-18, 06:48
Replies: 24
Views: 483
Posted By MattcAnderson
Yes, an expert would help here. Attached is an...

Yes, an expert would help here.
Attached is an image from Wikipedia Constructible polygons.
It enumerates all the odd numbers n such that that n-gon is constructible.
I counted the numbers in the...
Forum: MattcAnderson 2021-10-18, 06:16
Replies: 24
Views: 483
Posted By MattcAnderson
You are correct A1call. A square is...

You are correct A1call.

A square is constructible. Also an octagon is constructible (8 sides). So any n-gon with n=2^m is constructible.

According to Wikipedia (constructible polygon...
Forum: MattcAnderson 2021-10-18, 05:05
Replies: 24
Views: 483
Posted By MattcAnderson
constructable polygons and Fermat numbers

Thanks for the useful comments everyone.

See the Wikipedia article on Constructable polygon (https://en.wikipedia.org/wiki/Constructible_polygon).

Assuming that there are only 5 Fermat primes,...
Forum: MattcAnderson 2021-10-18, 04:38
Replies: 0
Views: 30
Posted By MattcAnderson
triangle

Hi all,

If you already know how to construct a triangle with a compass and marked
straightedge, then this will be review.

Enjoy.

Constructing Triangles
...
Forum: Puzzles 2021-10-16, 22:56
Replies: 43
Views: 1,494
Posted By MattcAnderson
Hi all Okay, I goofed. PIDOOMA is correct. ...

Hi all

Okay, I goofed. PIDOOMA is correct.

Yes [sp] inguneer is what I was.

Matt
Forum: MattcAnderson 2021-10-16, 17:56
Replies: 0
Views: 35
Posted By MattcAnderson
complete circle

Hi all,

This is not one of my most profound posts, but you can look at the picture. Some people never graduate.
Being a life long learner is nothing to be ashamed of.

Regards,
Matt
Forum: Puzzles 2021-10-16, 17:43
Replies: 43
Views: 1,494
Posted By MattcAnderson
Hi SmartMersenne and all, In the engineering...

Hi SmartMersenne and all,

In the engineering world, I learned an expression - PIDUMA - That is, pulled it directly out of my a**.

I heard a second hand story that there were electrical...
Forum: Lounge 2021-10-16, 17:37
Replies: 199
Views: 4,783
Posted By MattcAnderson
two people and a God reference

Hey all,

I saw this photo in this thread.

In my humble opinion, this image can be labeled, two people and a God reference.

Matt
Forum: MattcAnderson 2021-10-16, 15:45
Replies: 24
Views: 483
Posted By MattcAnderson
Smile 17-gon

Fermat Search dot org

Assuming F0 = 3, and that is the smallest Fermat number,

F1 = 5, and F2 = 17.

This implies that a regular 17-gon can be constructed with
pencil and compass and...
Forum: MattcAnderson 2021-10-16, 14:10
Replies: 44
Views: 2,813
Posted By MattcAnderson
Hi again all, a favorite number with 7...

Hi again all,

a favorite number with 7 digits is

9,878,901.

some factorization is 3*59*55813.

Due to Alpertron's webpage (https://www.alpertron.com.ar/ECM.HTM), I see this prime integer...
Forum: MattcAnderson 2021-10-15, 06:36
Replies: 1
Views: 144
Posted By MattcAnderson
a proof without words of good 'ol pythagorean theorem

Hi all,

So I placed high in a few math contests back in the 1990's. I even won two medals for it. They had a nice picture on them. Thank goodness for my wife, who puts up with me. So books...
Forum: MattcAnderson 2021-10-14, 14:20
Replies: 1
Views: 83
Posted By MattcAnderson
chaotic dynamic systems 30 years later

Hi all,

Because I am happily married and retired, I have time to review dynamic systems.
I took one class in college about Chaoitic Dynamical Systems, and it was, and is fun for me.
The...
Forum: And now for something completely different 2021-10-13, 20:26
Replies: 33
Views: 2,695
Posted By MattcAnderson
Hi all, Norman is doing a great...

Hi all,

Norman is doing a great project!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Matt
Forum: FactorDB 2021-10-13, 03:02
Replies: 0
Views: 267
Posted By MattcAnderson
A Factor Data Base contribution

see attached
Try factordb.com
Forum: MattcAnderson 2021-10-13, 02:13
Replies: 2
Views: 166
Posted By MattcAnderson
beauty in simplicity

Assuming you are familiar with one digit arithmetic in the base 10 system.

Look

7+8 = 15

You don't want what I have.
Forum: Puzzles 2021-10-13, 02:10
Replies: 43
Views: 1,494
Posted By MattcAnderson
Hi all, This is as far as I got with the...

Hi all,

This is as far as I got with the OP's cipher.

I used https://www.dcode.fr/transposition-cipher

I assume the transposition sequence is

abcde goes to
Forum: MattcAnderson 2021-10-12, 18:47
Replies: 0
Views: 77
Posted By MattcAnderson
Post advanced algebra lesson

I gave this lesson one time. In a community college.
Forum: MattcAnderson 2021-10-12, 18:45
Replies: 9
Views: 607
Posted By MattcAnderson
good one #smile /#

good one #smile /#
Forum: MattcAnderson 2021-10-10, 22:39
Replies: 9
Views: 607
Posted By MattcAnderson
All life is precious nor can any be replaced

All life is precious
nor can any be replaced
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