General  Fanmades 
Clubs are groups of Numberblocks they join if they have a certain property (e.g., being a square number, a triangular number, a prime number, etc.). The first clubs ever started were Odds and Evens, in the episode with the same name. Other clubs were introduced in Club Picnic. Numberblocks in clubs relate to other Numberblocks in a club, like TwentyEight would be related to ThirtySix in the Super Rectangles Club due to them both being superrectangles. Zero is the only Numberblock who isn't in any clubs.^{[1]}
Please do not add Numberblocks that haven't been figuredout yet in the list of members for each club. Don't add imaginary Numberblocks either, unless specified otherwise, .
If you want to add your own fanmade clubs, add them to the page on the navigator box.
Linear Sequences[]
Multiples Clubs[]
Founder: One
The Made of Ones Club is for Numberblocks that are made out of ones (i.e. the natural numbers). Currently every Numberblock is in the club except for Zero and Pi.
This club's formula is just , and it is A000027 in the OEIS.
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Founder: Two
Even Tops Club is for even numbers, since when they stand two blocks wide, they have an even top. All members of this club end in a zero, two, four, six or eight. Members of this club include Two, Four, Six, Eight, Ten, Twelve, Fourteen, Sixteen, Eighteen, Twenty, TwentyTwo, TwentyFour, TwentySix, TwentyEight, Thirty, ThirtyTwo, ThirtySix, Forty, FortyTwo, FortyEight, Fifty, FiftyFour, FiftySix, Sixty, SixtyFour, Seventy, SeventyTwo, Eighty, Ninety, One Hundred, Two Hundred, Three Hundred, Nine Hundred, One Thousand, Seven Thousand, Ninety Thousand, Orders of Magnitude, Two Million, Seven Million, Eight Million and Nine Million.
This club's formula is , and it is A299174 in the OEIS.
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Founder: Three
The Three Club is for Numberblocks that are multiples of three. They organised a party in Too Many Threes. Members of this club include Three, Six, Nine, Twelve, Fifteen, Eighteen, TwentyOne, TwentyFour, TwentySeven, Thirty, ThirtySix, FortyTwo, FortyFive, FortyEight, FiftyFour, Sixty, SixtyThree, SeventyTwo, EightyOne, Ninety, Three Hundred, Nine Hundred, Ninety Thousand, and Nine Million.
This club's formula is , and it is A328168 in the OEIS.
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Founder: Eight
Square With a Hole in Club is for Numberblocks that can make a “squarewithaholein” shape. All members of this club are multiples of four (With the Exception of Four himself). Badges of this club were given to Eight, Twelve, and Sixteen. Other members of this club are Twenty, TwentyFour, TwentyEight, ThirtyTwo, ThirtySix, Forty, FortyEight, FiftySix, Sixty, SixtyFour, SeventyTwo, Eighty, and One Hundred.
This club's formula is or , and it is A192544 in the OEIS.
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Founder: Seven
Rainbow Sevens Club is for Numberblocks that are multiples of seven. The members of this club seen with the badge are Seven, Fourteen, TwentyOne, and TwentyEight. Other members of this club include ThirtyFive, FortyTwo, FortyNine, FiftySix, SixtyThree, Seventy, and Seven Million.
This club's formula is , and it is A182341 in the OEIS.
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Founder: Eleven
The League of Elevens is for Numberblocks that are multiples of eleven. Members of this club include Eleven, TwentyTwo, and FiftyFive. Note that this club started before FiftyFive was introduced, hence the football/soccer theme of the club.
This club's formula is , and it is A008593 in the OEIS.
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Founder: Thirteen
The Undercover Thirteens Club is for multiples of Thirteen, like Thirteen and TwentySix. TwentyNine immediately reconsidered calling it "Falling Apart Club" after TwentySix broke down into two tens and threes. According to CBeebies' Numbers Are Everywhere club challenge, and the Numberblocks Annual 2023, “Falling Apart Club" is now its official name.^{[4]}
This club's formula is , and it is A008595 in the OEIS.
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Remainder Clubs[]
Founder: Nine
Odd Blocks Club is for odd numbers, since when they stand two blocks wide, they have an odd block sticking out from on top. All members of this club end in a one, three, five, seven or nine. Members of this club include One, Three, Five, Seven, Nine, Eleven, Thirteen, Fifteen, Seventeen, Nineteen, TwentyOne, TwentyThree, TwentyFive, TwentySeven, TwentyNine, ThirtyOne, ThirtyFive, FortyFive, FortyNine, FiftyFive, SixtyThree, and EightyOne.
The club's formula is , and it is A005408 in the OEIS.
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Founder: One (Most likely)
The OneEnders Club is a club for Numberblocks that end in a one. Members of this club include One, Eleven, TwentyOne, ThirtyOne, and EightyOne. The club isn't in the show itself, but rather in its official youtube channel. The proof of this club existing is of 0:22 of this video.
This club's formula is , and it is A017281 in the OEIS.
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Founder: TwentyNine
The NineEnders Club is for Numberblocks that end in a nine. Members of this club include Nine, Nineteen, TwentyNine, and FortyNine.
This club's formula is , and it is A017377 in the OEIS.
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Quadratic Sequences[]
Founder: Sixteen
Square Club is a club whose members are all square numbers. It's the first club in the show ever, being started in the episode of the same name. Their eyes are rounded square. (exception: One). Members of this club are One, Four, Nine, Sixteen, TwentyFive, ThirtySix, FortyNine, SixtyFour, EightyOne, One Hundred, Nine Hundred and other Orders of Magnitude.
The club's formula is , and it is A000290 in the OEIS.
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Founder: Fifteen
Step Squad Club is for Numberblocks that can make step shapes (also known as triangular numbers). Their glasses are step shapes in the same colours as the step squads they represent, and all of them that are greater than Ten (except Three Hundred, who has not appeared physically) wear them. One, Three, Six, and Ten only wear stepshaped masks while they are actively being step squads due to that not being their primary characteristic. Many of them also wear boots the same colours as their blocks, but One, Three, Six, Ten, and FiftyFive do not. Members of this club are One, Three, Six, Ten, Fifteen, TwentyOne, TwentyEight, ThirtySix, FortyFive, FiftyFive and Three Hundred.
This club's formula is , , or , and it is A000217 in the OEIS.
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Cubic Sequences[]
Founder: TwentySeven
Cube Club is for cube numbers. Currently, its only members are One, Eight, TwentySeven, SixtyFour, and some Orders of Magnitude
This club's formula is , and it is A000578 in the OEIS.
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Factorization Clubs[]
Founder: TwentyNine
Prime Club is for prime Numberblocks; ones that can only make prime positions (meaning being one block wide by their own number tall, and one block tall by their number wide) and no others. TwentyThree, TwentyNine, and ThirtyOne are members of this club. Two, Three, Five, Seven, Eleven, Thirteen, Seventeen, and Nineteen are also in the club, but they have never been seen with the badge.
This club's formula is or , with the exception of Two and Three, and it is A000040 in the OEIS.
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Founder: Twelve
Super Rectangle Club is for Numberblocks that can make six or more rectangle arrays. They wear Array Displays. Members seen with the club badge are Twelve, Eighteen, Twenty, TwentyFour, TwentyEight and ThirtyTwo. Other members of the club include Thirty, ThirtySix, Forty, FortyTwo, FortyFive, FortyEight, Fifty, FiftyFour, FiftySix, Sixty, SixtyThree, SixtyFour, Seventy, SeventyTwo, Eighty, Ninety, and One Hundred, but were never seen with the club badge.
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Twelve's Rectangles (6/6):

Eighteen's Rectangles (6/6):

Twenty's Rectangles (6/6):

TwentyFour's Rectangles (8/8):

TwentyEight's Rectangles (6/6):

Thirty's Rectangles (8/8):

ThirtyTwo's Rectangles (6/6):

ThirtySix's Rectangles (9/9):

Forty's Rectangles (8/8):

FortyTwo's Rectangles (2/8):

FortyFive's Rectangles (2/6):

FortyEight's Rectangles (2/10):

Fifty's Rectangles (3/6):

FiftyFour's Rectangles (2/8):

FiftySix's Rectangles (2/8):

Sixty's Rectangles (6/12):

Super Duper Rectangle Club is for Numberblocks that can make eight arrays or more. Currently, TwentyFour is the only member of this club who was actually seen with the badge, ThirtySix is also a Super Duper Rectangle member as stated in his Fact File. Thirty, Forty, FortyTwo, FortyEight, FiftyFour, FiftySix, Seventy, and Eighty are also in the club, but were never seen with the badge. One Hundred has nine factors but is probably in the Super Duper Rectangle Club because the name would probably change at ten arrays, and she only has one more ray than eight, not two more. It is debatable whether Sixty, Ninety and SeventyTwo are in the club since they all have at least twelve factors, but they might be judging by the fact that TwentyFour was also seen with the Super Rectangle Club badge.
Limited Sequences[]
Founder: Twenty
The Roaring Twenties is for Numberblocks ranging from Twenty to TwentyNine.
This club's formula is , where and , and it is not in the OEIS as it is a limited sequence.
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 ↑ It can be arguable because some of the sequences in the clubs include 0. (3 × 0 and 0 × 3 in Three Club)
 ↑ These are the arrangements where the factors are in a line, as if they are on a Times Table. The members will get longer.
 ↑ These are the arrangements where the factors are stacked like a tower. The members will get taller.
 ↑ https://uploadsssl.webflow.com/5ebbbacd07f0f1a942ac30dc/60fa8ee5ba2cc7af47d3819e_Number%20Are%20Everywhere.pdf