12 Days of Christmas
422nd
Christmas Trees
551st
Diamonds
393rd
Divisors
305th111th
Emirp Numbers
197th
Evil Numbers
346th355th
Fibonacci
168th173rd
Fizz Buzz
1,097th880th
Happy Numbers
302nd
Leap Years
270th456th
Niven Numbers
143rd198th
Odious Numbers
282nd242nd
Pangram Grep
298th
Pascal’s Triangle
81st
Pernicious Numbers
409th
Prime Numbers
80th
313th
Quine
30th67th
Sudoku
π
233rd
τ
173rd
φ
195th