12 Days of Christmas
378
398
99 Bottles of Beer
336
Abundant Numbers
688
Arabic to Roman
436
Arrows
568
Christmas Trees
603
Cubes
381
Diamonds
489
Divisors
844
748
Emirp Numbers
458
Emojify
331
Evil Numbers
755
Fibonacci
789
786
Fizz Buzz
701
632
Fractions
527
990
Happy Numbers
490
Happy Numbers (Long)
604
Intersection
308
Kolakoski Constant
542
Kolakoski Sequence
611
547
Leap Years
641
Leyland Numbers
754
Look and Say
528
Morse Decoder
146
Morse Encoder
161
Niven Numbers
674
Odious Numbers
783
Ordinal Numbers
563
Pangram Grep
690
Pascal’s Triangle
659
Pernicious Numbers
331
Prime Numbers
643
578
Recamán
597
Rock-paper-scissors-Spock-lizard
437
Roman to Arabic
430
Seven Segment
397
Sierpiński Triangle
131
Smith Numbers
621
Tongue-twisters
641
United States
241
Vampire Numbers
333
Van Eck Sequence
464
λ
86
π
425
τ
423
φ
701
√2
702
𝑒
624
605