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MattcAnderson 2021-12-08 16:27

The Repository

MattcAnderson 2021-12-11 03:01

The Repository
Secrets of the immortals

MattcAnderson 2021-12-24 13:53

The Repository
Candles were invented in China about 300 bc

MattcAnderson 2022-03-05 12:23

This year's 'MathFest 2022' will be in Philadelphia Pennsylvania USA, in August.
If I go, I will not be with close friends or family, but as a lifetime member of MAA, I want to pursue my passion.

I have printed notebooks to share about k-tuples, maple code, and prime constellations.
It is a good place to meet other like minded individuals

see - [URL=""][/URL]

Matthew Anderson

MattcAnderson 2022-03-21 00:11

This puzzle is too hard for me.
I found that 10,007 is the smallest 5 digit prime number.
Also, there are 8,363 five digit prime numbers.
Can I get someone to check my results?

PS The IBM [URL=""]challenge puzzle[/URL] for March 2022 can be found in this clickable link.

rudy235 2022-03-21 07:19

[QUOTE=MattcAnderson;602196]This puzzle is too hard for me.
I found that 10,007 is the smallest 5 digit prime number.
Can I get someone to check my results?


Gladly. The smallest five digit number is 10000. ( or. -99999 )

MattcAnderson 2022-05-06 23:05

have a nice day

MattcAnderson 2022-05-11 14:17

My first job was on a farm
In school i did wash dish I also wrote in the margin of a black text book part of graduate study


xilman 2022-05-11 16:42

Life is like a sewer. What you get out of it depends on what you put into it.

MattcAnderson 2022-05-27 06:14

Life is like a box of chocolates. It is different every day.

MattcAnderson 2022-06-19 06:11

Franklin D. Roosevelt Jr. : [URL=""]Franklin_D._Roosevelt_Jr.[/URL]

Have a nice day.

I give you my best, everybody.

Mr. (Matthew) Anderson

MattcAnderson 2022-06-29 07:05

Welcome to !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

MattcAnderson 2022-06-29 17:52

Welcome to !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

MattcAnderson 2022-07-01 18:27

Welcome to !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Uncwilly 2022-07-01 20:15

Matt, if you haven't figured it out yet:
There is no need to repeatedly welcome the same person to the forum.
There is no need to welcome to the forum that has been here for ~2 years.

MattcAnderson 2022-07-03 00:30

Welcome to .

MattcAnderson 2022-07-03 02:13

Welcome to
Have a nice day.

MattcAnderson 2022-07-08 02:51

Welcome in
Have a nice day

paulunderwood 2022-07-08 03:54

Ex-teacher, now useless concierge?

MattcAnderson 2022-07-08 04:59

Ex-teacher, now useless concierge? Wrote a non-fiction about the trinomial x^2+x+41. Good fun.
In a word no.

MattcAnderson 2022-07-09 17:30

Welcome in OP

paulunderwood 2022-07-09 17:38


MattcAnderson 2022-07-09 20:28

welcome in new person

MattcAnderson 2022-07-09 20:33

Have a nice day

paulunderwood 2022-07-09 20:33

:rant: Do it again and you will be put in the sin bin for a while.

MattcAnderson 2022-07-10 00:25

All possible
Have a nice day

In my world, conjecture is like probably true

MattcAnderson 2022-07-10 00:58

Sounds good

MattcAnderson 2022-07-10 02:49

appreciate your efforts

MattcAnderson 2022-11-17 15:20

Primes as not a possible numerical anagram ... interesting
Here is some simple minded Maple code. The hardest part was counting all the 2s.

> for a from 2 by 2 to 100 do
if isprime(222222222222222219+a) then print(222222222222222219+a, "is prime") end if end do;

222222222222222221, "is prime"
222222222222222281, "is prime"
A pair of p18. (18 digit prime numbers)

Have a nice day.
I put another code snippet at my web-page - [URL=""][/URL]
Try to find under "more files" 'prime but not anagram.txt'

okay, after some manual searching, I found a not-anagram cosisting of 63 twos and one 7.

> for a from 2 by 2 to 100 do
if isprime(2222222222222222222222222222222222222222222222222222222222222219+a)
then print(2222222222222222222222222222222222222222222222222222222222222219+a, "is prime") end if end do;

2222222222222222222222222222222222222222222222222222222222222227, "is prime"
2222222222222222222222222222222222222222222222222222222222222287, "is prime"

> evalf(log10(2222222222222222222222222222222222222222222222222222222222222219+a));
> # so we are looking at a pair of 64 digit prime numbers. - maybe an original calculation (?World record?)
Anyone else can find bigger not-anagram primes using a similar technique.

> for a from 2 by 2 to 1000 do
if isprime(22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222219+a)
then print(22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222219+a, "is prime")
end if end do;


222222222222222223, "is prime"

> evalf(log10(22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222223));
> # a 95 digit number

It is clear to me that anyone with the right software, and a little effort, one can find bigger than a 95 digit ,
not an anagram prime number.
Maple is a fine tool.
Have a nice day.

Wishing you all the best.

Batalov 2022-11-17 21:19

[QUOTE=MattcAnderson;617998]Primes as not a possible numerical [B]anagram [/B]... interesting
222222222222222221, "is prime"
222222222222222281, "is prime"
A pair of p18. (18 digit prime numbers)
Every input is valuable. But all of what you wrote are [B]not [/B]anagrams.

MattcAnderson 2022-11-17 21:40

I found a thing
Since I have a handy dandy tool that can deal with large integers (Maple Software)
I have found a 121 digit prime.

> temp := 2222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222221;
tem2 := 2222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222227;
if isprime(temp) then print(temp, " is prime") end if;
if isprime(tem2) then print(tem2, "is prime") end if;

22222222222222222222222222222222222222222221, " is prime"
> evalf(log10(temp));
> # so we have found a 121 digit prime number such that any permutation of its digits yields a composite number.
# good fun :--)

# Matt

And to be sure, an anagram deals with the English language.
This is a fast and loose post.
Cheers !!!

chalsall 2022-11-17 23:50

[QUOTE=MattcAnderson;618016]This is a fast and loose post.[/QUOTE]

So is [URL=""]this.[/URL]

Imagine a young child with a C64, and a subscription to [URL=""]Scientific American[/URL].

While that child worked at a sawmill to pay for his later education.

And coded... Day in. Day out...

And, stayed away many nights wondering if there really was a dog...


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