The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Happy Numbers in Python in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 400th fynnkroeger 462 104 16ms 8 Feb 2021 400th feherd 462 104 16ms 30 Aug 2021 400th amollberg 🇸🇪 462 104 16ms 29 Jan 2022 400th MarioPlq 462 104 11ms 24 Jun 2022 400th no53488 462 104 11ms 5 Dec 2022 400th Wildst 462 104 10ms 7 Jul 2023 407th lrustand 457 105 10ms 15 Jan 2018 407th djtuBIG-MaliceX 457 105 16ms 30 Jan 2018 407th Faweks1 457 105 17ms 1 Aug 2018 407th SupImDos 457 105 10ms 10 Nov 2020 407th dillon-duncando 457 105 16ms 1 Dec 2021 407th Ch3ngL0rd 457 105 11ms 16 Jan 2024 407th jamesthekee 457 105 11ms 25 Jan 2025 407th kistlerf 🇨🇭 457 105 17ms 16 May 2025 415th dave-ck 453 106 9ms 3 Mar 2018 415th RyanCarrusca 453 106 9ms 21 Feb 2019 415th oriphi 453 106 57ms 17 Jun 2019 415th evanrittner 453 106 16ms 12 Jan 2020 415th oAsAo 453 106 29ms 21 Jan 2020 415th hymanimy 453 106 17ms 11 Aug 2021 415th eshilo-draper 453 106 17ms 18 Nov 2022 415th ZoeMcG 453 106 10ms 8 Jan 2023 415th mathisfun271 453 106 96ms 13 Feb 2024 415th Ythaenagor 453 106 17ms 5 Aug 2024 425th stordev 449 107 17ms 26 Feb 2021 425th KrausRaus 🇺🇸 449 107 10ms 15 Apr 2021 425th petroselo 449 107 16ms 29 Dec 2021 425th jumelet 🇳🇱 449 107 16ms 13 Dec 2022 425th jameswmccarty 449 107 17ms 11 Jul 2024 425th PyryL 🇫🇮 449 107 17ms 15 Mar 2025 425th kbeat 🇰🇿 449 107 17ms 21 May 2025 432nd 05st 444 108 16ms 14 Feb 2022 432nd CameronGBell 444 108 9ms 7 Mar 2022 432nd SniperSmiley 🇺🇸 444 108 16ms 29 Jun 2022 432nd dtaylor0 444 108 16ms 25 Dec 2022 432nd ridingqwerty 🇺🇸 444 108 16ms 30 Nov 2023 432nd sultan 444 108 11ms 2 Apr 2024 432nd jfallon1997 444 108 17ms 16 May 2024 432nd 40fied4t 444 108 10ms 21 May 2025 440th tkwa 440 109 17ms 5 Dec 2018 440th Bodo171 440 109 14ms 24 Nov 2022 440th DaCuteRaccoon 440 109 10ms 30 Nov 2022 440th jagannathhari 440 109 17ms 21 Oct 2023 440th ian-h-chamberlain 🇺🇸 440 109 17ms 16 Oct 2025 445th ValNyz 436 110 22ms 20 Apr 2018 445th hyvyys 436 110 10ms 16 Sep 2020 445th vodker1 436 110 16ms 8 Mar 2022 445th berdzi 436 110 10ms 15 Mar 2022 445th VictorFordham 436 110 16ms 12 Oct 2023 445th NanduBC 436 110 16ms 7 Sep 2024 451st ArturLange 432 111 10ms 5 Sep 2018 451st adesanjo 432 111 17ms 8 Jun 2019 451st vonKrafft 432 111 10ms 26 Mar 2020 451st TinyTheBrontosaurus 432 111 11ms 4 Dec 2023 451st 123mjb 432 111 11ms 26 Jun 2025 456th boxjelly 429 112 10ms 10 Jan 2021 456th Pena86 429 112 10ms 18 Feb 2021 456th Kasci 429 112 74ms 28 Dec 2021 456th Omega65536 🇩🇪 429 112 11ms 29 Nov 2022 456th epic-programmer-guy 429 112 16ms 26 Dec 2023 461st nkansal96 425 113 16ms 21 May 2019 461st TobyBoyne 🇬🇧 425 113 16ms 1 Jun 2019 461st dymowski 425 113 16ms 24 Jul 2019 461st weberax 425 113 9ms 30 Nov 2019 461st AIn0n 425 113 16ms 15 Jul 2021 461st super-tux 425 113 65ms 9 Aug 2021 461st olavaga 425 113 10ms 13 Aug 2021 461st nkoppel 425 113 11ms 20 Oct 2022 461st Skwerl23 425 113 16ms 3 Feb 2023 461st Gopalkataria 🇮🇳 425 113 540ms 6 Mar 2025 471st kenny14231 421 114 10ms 6 Aug 2022 471st aalec 421 114 109ms 24 Apr 2024 471st ApoChagi 421 114 18ms 25 Oct 2025 474th michelebastione 🇮🇹 417 115 10ms 19 Nov 2019 474th artieleach 417 115 17ms 12 Dec 2020 474th ktanaka 417 115 10ms 11 Jan 2024 474th clayboll99 417 115 10ms 11 Jul 2025 474th arjunarya1 417 115 10ms 28 Aug 2025 479th sambirnbaum1 414 116 10ms 7 Sep 2019 479th markus-rekdal 414 116 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