12 Days of Christmas
427th
Christmas Trees
560th
Diamonds
398th
Divisors
307th114th
Emirp Numbers
201st
Evil Numbers
346th360th
Fibonacci
168th176th
Fizz Buzz
1,099th881st
Happy Numbers
303rd
Leap Years
273rd460th
Niven Numbers
144th200th
Odious Numbers
284th244th
Pangram Grep
303rd
Pascal’s Triangle
82nd
Pernicious Numbers
414th
Prime Numbers
81st
318th
Quine
30th67th
Sudoku
π
238th
τ
177th
φ
197th