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MattcAnderson 2021-06-10 17:01

Today's Favorite Mega Number
A favorite mega number must be a whole number greater than one million.

If you want to go down this rabbit hole,

see Matt Parker and Brady Herron on YouTube

Search for "Stand Up Maths" or "Singing Banana.

easy click - [URL=""][/URL]

So today, we have 1,754,847. Chosen for an arbitrary reason. It ends in 7 so it is not divisible by 2 or 5. It is less than two million, and to me,

17 is strong because it sounds like 'save a team'.

So, thanks to Maple - computer algebra system, we see that

This C7, that is seven digit composite number, namely 1,754,847 factors as

3 * 3 * 73 * 2671.

That is, a P1, another P1, a P2 and a P4 : -- )

Just count the digits.

Good Fun.


MattcAnderson 2021-06-12 06:20

Hi again all

My new favorite Mega number is


and, thankfully, due to Maple, computer algebra system, we see a prime factorization, so

ifactor(1,249,281) is 3*3*11*12619. Very Interesting



MattcAnderson 2021-06-12 06:28

And another one

due to

changed one digit from the other one

it is true that

9249281 = 137 · 181 · 373



MattcAnderson 2021-06-12 07:47

Matt here,

with another fun Mega number, starting with one

computer tool - Maple tells me that



(2) (13) (37) (2011)

Ah yess, 2011 a very good year for music.

We remember that Adele sang "Someone Like You"

Still Fun.


MattcAnderson 2021-06-12 08:43

Starting from the middle and using year numbers

we have

2021 = 43*47

see Michael Penn discuss a Putnam exam question



2019 = 3*673


2021*2019 = 4,080,399.


ifactor(4,080,399) is 3*43*47*673.

again Maple, the wonderful computer algebra system did all the heavy lifting, I mean factoring.

Fun for me, and you, fine reader.


MattcAnderson 2021-06-12 12:51

Hi again all,

This is a new day, and we have a new number

Again, our tool of choice is Maple, a fully capable computer algebra system.

We see that

ifactor(2,295,147) = 3*23*29*31*37.

We have a fairly large Composite number that factors so some relatively small Prime numbers.

Specifically a C7 (seven digit composite number) - factors to a P1 and four P2.

We say that 2,295,147 is 37-smooth because 37 is the greatest prime divisor of our C7.

More fun every day.



MattcAnderson 2021-06-12 21:31

Hi again all

This is still a lot of fun for me.

As before, Maple - a super duper computer algebra system, was used.

We see that

ifactor(1826527) is 383* 251*19

so 1,832,527 is 383-smooth.

And, indeed, every positive integer is something-smooth.


Viliam Furik 2021-06-12 21:34

[QUOTE=MattcAnderson;580575]see Matt Parker and [STRIKE]Brady Herron[/STRIKE] on YouTube

His name is Brady Haran, FYI.

Batalov 2021-06-12 22:18

Thank you Matt!

And thank you for the upcoming 8,999,994 more posts, that will surely follow (we have no doubts).
Please stick to your own rules and post no more than 1 of these "Today's" posts per day.
So far you have failed to uphold your own standard. We are disappointed.

axn 2021-06-13 02:18

Brady is the producer of Numberphile (and many other ) channel.

Singing Banana is Prof. James Grime.


LaurV 2021-06-13 04:34

We love Zvezdelina! Our favorite teacher EVER!

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