12 Days of Christmas
12th
99 Bottles of Beer
30th
Abundant Numbers
14th
748th
Abundant Numbers (Long)
15th
389th
Arabic to Roman
12th
Arithmetic Numbers
20th
Arrows
12th
18th
15th
11th
13th
Ascending Primes
13th
ASCII Table
18th
Card Number Validation
17th
Catalan Numbers
8th
Christmas Trees
11th
Collatz
20th19th19th179th52nd90th17th13th9th51st9th20th20th24th13th10th13th11th14th12th42nd12th17th19th18th230th36th36th15th40th17th7th26th42nd30th18th553rd18th19th65th67th14th
20th9th13th7th23rd
Day of Week
21st
Diamonds
29th
11th
64th
Divisors
12th
Emirp Numbers
29th30th
20th
Emirp Numbers (Long)
15th
7th
Emojify
18th
Evil Numbers
101st98th
19th
52nd
Evil Numbers (Long)
16th
Factorial Factorisation
19th
Farey Sequence
21st
Fibonacci
30th
Fizz Buzz
1st
Foo Fizz Buzz Bar
3rd
Fractions
16th
Happy Numbers
32nd32nd
39th
19th
Happy Numbers (Long)
9th
Intersection
9th
Inventory Sequence
11th
ISBN
28th
22nd
21st
18th
Kaprekar Numbers
11th
Kolakoski Constant
8th
Kolakoski Sequence
20th
Leap Years
19th
Leyland Numbers
7th
ln 2
11th
Look and Say
13th
11th
Lucky Numbers
30th
12th
Mandelbrot
11th
Medal Tally
10th
Minesweeper
10th
11th
9th
Niven Numbers
14th
Niven Numbers (Long)
14th
Number Spiral
29th
Odious Numbers
18th
Odious Numbers (Long)
13th
Pascal’s Triangle
13th
36th
Pernicious Numbers
54th57th
24th
Pernicious Numbers (Long)
10th
Prime Numbers
11th
Prime Numbers (Long)
5th
Quine
1st
72nd
Recamán
11th
Repeating Decimals
9th
Rock-paper-scissors-Spock-lizard
18th12th
ROT13
9th
Set
6th
Sierpiński Triangle
12th
Smith Numbers
9th
Spelling Numbers
7th
Ten-pin Bowling
17th
Time Distance
9th
Tongue-twisters
21st
Transpose Sentence
16th
Trinomial Triangle
9th
United States
7th
Vampire Numbers
16th
9th
Van Eck Sequence
11th
Zeckendorf Representation
11th
π
15th
τ
14th
φ
4th
√2
11th
𝑒
8th
33rd