12 Days of Christmas
15th14th
5th139th12th
Abundant Numbers
32nd14th228th48th14th845th23rd
Abundant Numbers (Long)
27th15th120th36th14th434th16th
Arithmetic Numbers
9th13th104th30th14th404th11th
Arrows
4th5th
5th7th57th5th
ASCII Table
16th
79th21st9th269th10th
Collatz
32nd18th240th36th14th439th10th
Divisors
29th18th344th79th21st1,221st46th
Evil Numbers
37th15th57th27th17th130th12th
Evil Numbers (Long)
35th11th38th18th7th155th7th
Farey Sequence
11th
Fibonacci
67th31st294th135th
878th22nd
Fizz Buzz
65th26th1,104th217th48th1,706th68th
Leap Years
27th8th202nd26th4th168th8th
Niven Numbers
37th26th194th36th
265th31st
Niven Numbers (Long)
32nd16th125th18th16th355th15th
Odious Numbers
37th15th49th25th14th94th13th
Odious Numbers (Long)
35th11th34th19th7th77th7th
Pascal’s Triangle
18th14th125th17th7th429th14th
Pernicious Numbers
28th5th47th25th1st70th18th
Prime Numbers
41st
35th20th318th28th
Prime Numbers (Long)
29th
112th22nd8th178th16th