12 Days of Christmas
117th
99 Bottles of Beer
241st
Abundant Numbers
21st
14th50th
Abundant Numbers (Long)
6th26th
Arithmetic Numbers
69th
Catalan Numbers
188th
Catalan’s Constant
13th
Christmas Trees
3rd388th
Collatz
27th
22nd3rd57th20th
14th27th
Day of Week
1st
Diamonds
110th
Divisors
165th
76th
11th67th160th44th
2nd1st
Emirp Numbers
27th97th
Emirp Numbers (Long)
131st
Evil Numbers
77th60th
8th42nd85th
25th277th
35th
Evil Numbers (Long)
9th
48th
17th180th
Factorial Factorisation
141st
Fibonacci
149th39th112th
44th
1st29th1st1st54th8th1st19th167th
Fizz Buzz
13th
74th53rd
Foo Fizz Buzz Bar
39th1st
Fractions
71st
12th162nd
Happy Numbers
48th
Happy Numbers (Long)
156th
Kolakoski Sequence
11th18th
Leap Years
21st
40th125th
Levenshtein Distance
140th
Leyland Numbers
15th293rd
Niven Numbers
87th33rd47th
25th25th112th29th
20th122nd
Niven Numbers (Long)
23rd
15th77th
Odious Numbers
8th
97th
21st135th
Odious Numbers (Long)
8th
54th
16th132nd
Ordinal Numbers
99th
Pangram Grep
22nd48th
Pascal’s Triangle
68th
Pernicious Numbers
24th
29th80th
Prime Numbers
165th
29th
143rd
28th339th
Prime Numbers (Long)
169th
Quine
128th
108th
58th
Recamán
16th266th
Reverse Polish Notation
49th
78th
Sierpiński Triangle
161st
Van Eck Sequence
165th
𝑒
27th58th21st21st46th50th32nd14th26th44th36th13th27th21st10th13th
19th353rd31st