Say Anything - Part 31


#1

31:

31 is the number of regular polygons with an odd number of sides that are known to be constructible with compass and straightedge.

31 is the third Mersenne prime (25 − 1)[1] and the eighth Mersenne prime exponent, as well as the fourth primorial prime, and together with twenty-nine, another primorial prime, it comprises a twin prime. As a Mersenne prime, 31 is related to the perfect number 496, since 496 = 2(5 − 1)(25 − 1). 31 is also the 4th lucky prime[2] and the 11th supersingular prime.[3]

31 is a centered triangular number,[4] the lowest prime centered pentagonal number[5] and a centered decagonal number.[6]

For the Steiner tree problem, 31 is the number of possible Steiner topologies for Steiner trees with 4 terminals.

At 31, the Mertens function sets a new low of −4, a value which is not subceded until 110.

31 is a centered pentagonal number

No integer added up to its base 10 digits results in 31, making 31 a self number.[7]

31 is a repdigit in base 5 (111), and base 2 (11111).

The numbers 31, 331, 3331, 33331, 333331, 3333331, and 33333331 are all prime. For a time it was thought that every number of the form 3w1 would be prime. However, the next nine numbers of the sequence are composite


#2

Low content rush post for first!


#3

Nerd alert! :man_student:


#4

Oh!! @naturallycured beat me to the first post!

:stuck_out_tongue:


#5

that was weird.


#6

I don’t know what to say! :smile:


#7

Life is weirder!


#8

I hate cigarette cravings. I am experiencing them quite a bit thinking about the unfavorable position I have in life at the moment


#9

the position i have in life atm is lying down, i’ll probably get up soon and ruin it all :joy::joy:


#10

I wish I could have a break from fighting.


#11

I finished reading a play last night! Talk Radio.

It was really good. Kinda sad at times. Kinda funny too.

It’s based on a real life, talk radio DJ.


#12

For some reason I like Seinfeld.


#13

I’m hungry today but nothing sounds good. Well, that’s a lie, I could really go for a salted grapefruit. But, alas, I don’t have that. So I’m just sitting here with a cup of tea being dissatisfied.


#14

I wanted the first post !! :sob:


#15

I like Seinfeld, too. One of the funniest shows ever, in my opinion.


#16

You can put salt on a grapefruit? Hmmm… I wonder how that would taste.

I am cooking some fridays potato skins with cheese and bacon. Got sour cream for them too.


#17

I tried to paint my nails but it came out awful and I stained the inside of my sweatshirt. I’m gonna remove the nail polish when cell phone group is over.

Cell phone group is early today because I think it’s AA who’s coming in. I’m considering going.


#18

This is really the first post, the others above were posted in error and should be deleted :stuck_out_tongue:


#19

What do you put on your grapefruit? I thought salting it was normal.


#20

Usually sugar, but I just searched in on the web and it says salt can counter the fruit’s bitterness? I never thought of that. That’s what I use the sugar for.