12 Days of Christmas
9th
99 Bottles of Beer
30th
Abundant Numbers
14th
730th
Abundant Numbers (Long)
15th
381st
Arabic to Roman
12th
Arithmetic Numbers
20th
Arrows
12th
17th
14th
12th
13th
Ascending Primes
13th
ASCII Table
18th
Card Number Validation
17th
Catalan Numbers
8th
Christmas Trees
11th
Collatz
11th20th19th19th179th52nd90th16th12th9th51st9th20th20th24th11th10th13th11th14th12th41st12th17th19th18th230th36th36th15th40th17th7th26th42nd30th18th547th17th18th65th67th14th
20th9th13th7th23rd
Day of Week
21st
Diamonds
29th
11th
63rd
Divisors
12th
Emirp Numbers
29th28th
16th
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
2nd
Fractions
16th
Happy Numbers
31st30th
38th
14th
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
18th
Leyland Numbers
7th
ln 2
11th
Look and Say
13th
11th
Lucky Numbers
30th
12th
Mandelbrot
11th
Medal Tally
12th
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
11th13th
ROT13
9th
Set
6th
Sierpiński Triangle
12th
Smith Numbers
8th
Spelling Numbers
7th
Ten-pin Bowling
17th
Time Distance
9th
Tongue-twisters
20th
Transpose Sentence
16th
Trinomial Triangle
9th
United States
7th
Vampire Numbers
14th
8th
Van Eck Sequence
11th
Zeckendorf Representation
11th
π
15th
τ
14th
φ
2nd
√2
1st
𝑒
8th
33rd