12 Days of Christmas
1,215th
Collatz
283rd
Divisors
2,134th
Evil Numbers
3,650th
Fibonacci
4,392nd
Fizz Buzz
137th
Foo Fizz Buzz Bar
981st
Happy Numbers
1,117th
Happy Numbers (Long)
920th
Kolakoski Sequence
1,105th
Leap Years
499th
Leyland Numbers
881st
Look and Say
299th
Niven Numbers
975th
Pascal’s Triangle
1,212th
Pernicious Numbers
2,519th
Prime Numbers
981st
Quine
2,307th
Recamán
854th
Tongue-twisters
643rd