12 Days of Christmas
821
24 Game
401
99 Bottles of Beer
718
Abundant Numbers
802
809
784
Catalan Numbers
690
Christmas Trees
685
Collatz
795
CSS Colors
217
Cubes
574
Diamonds
561
Divisors
749
984
933
Emirp Numbers
451
452
622
Emojify
417
Evil Numbers
725
801
Factorial Factorisation
433
Farey Sequence
419
Fibonacci
674
719
934
Fizz Buzz
846
896
976
Gijswijt’s Sequence
332
Happy Numbers
714
Kolakoski Sequence
411
771
657
Leap Years
831
878
Leyland Numbers
958
ln 2
777
Look and Say
781
Lucky Numbers
572
Morse Decoder
373
Morse Encoder
380
N Queens
543
Niven Numbers
611
921
Niven Numbers (Long)
740
Odious Numbers
712
783
Ordinal Numbers
804
Pangram Grep
909
Pascal’s Triangle
907
537
Pernicious Numbers
711
Pernicious Numbers (Long)
742
Prime Numbers
767
645
912
Quine
946
Recamán
553
816
Reverse Polish Notation
765
Seven Segment
494
585
Sierpiński Triangle
586
550
Tongue-twisters
590
Vampire Numbers
98
828
Van Eck Sequence
710
π
88