The Calendar hole will go live in approximately 11 days. Why not try and solve it ahead of time?
Jacobi Symbol in all languages 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 321st albanian-laundromat 673 132 875ms 19 Sep 2025 321st CaedenHarper 🇨🇦 673 132 802ms 6 Nov 2025 323rd CaedenHarper 🇨🇦 672 211 442ms 6 Nov 2025 324th Yewzir 🇧🇪 671 113 353ms 7 May 2024 325th lynn 669 120 1,293ms 3 Jun 2022 326th nwellnhof 🇩🇪 669 121 30ms 8 Jun 2022 327th uttumuttu 🇫🇮 668 124 10ms 24 May 2022 327th tayloia 🇬🇧 668 124 9ms 11 May 2023 329th SirBogman 🇺🇸 667 93 2ms 30 Oct 2022 329th retrohun 667 93 2ms 9 Nov 2022 331st DialFrost 🇸🇬 667 161 2ms 12 Feb 2024 332nd AlephSquirrel 666 216 6ms 30 Oct 2024 333rd nwellnhof 🇩🇪 663 82 162ms 20 May 2022 334th janbehrens 🇩🇪 662 189 355ms 3 Jul 2023 335th snoozingnewt 🇨🇦 661 148 109ms 27 days ago 336th Alex-x90 🇺🇸 661 187 387ms 11 May 2024 337th sean-niemann 🇺🇸 660 94 2ms 14 Aug 2023 338th MeWhenI 🇻🇦 659 208 40ms 4 Sep 2024 339th MeWhenI 🇻🇦 658 79 55ms 16 Aug 2022 340th FortuiteMan 🇫🇷 658 123 11ms 23 Aug 2023 341st Yax42 🇫🇷 658 190 433ms 30 Jul 2025 342nd adriweb 🇫🇷 657 160 29ms 21 Aug 2023 343rd MeWhenI 🇻🇦 657 271 32ms 23 Jun 2024 344th elgan65536 656 238 226ms 9 Mar 2024 345th Shanethegamer 🇺🇸 655 185 548ms 7 Jun 2022 346th Shanethegamer 🇺🇸 655 190 147ms 12 May 2022 347th stefangimmillaro 654 163 99ms 15 Jul 2023 348th MeWhenI 🇻🇦 654 189 497ms 23 Jun 2024 349th janbehrens 🇩🇪 653 217 456ms 3 Jul 2023 350th Sakisan 🇧🇪 652 127 9ms 12 May 2022 350th janbehrens 🇩🇪 652 127 10ms 3 Jul 2023 352nd roavin 651 165 2ms 26 May 2022 353rd CatsAreFluffy 650 190 79ms 30 Dec 2022 354th AlephSquirrel 649 57 49ms 26 Jun 2023 355th MeWhenI 🇻🇦 648 124 978ms 25 May 2022 356th itsh01 647 128 9ms 4 Jul 2022 357th Shanethegamer 🇺🇸 647 135 21ms 12 May 2022 358th ovs-code 🇩🇪 647 136 970ms 5 Jun 2024 359th CatsAreFluffy 647 166 2ms 25 Jan 2023 359th Alex-x90 🇺🇸 647 166 2ms 14 Dec 2023 361st snoozingnewt 🇨🇦 647 195 112ms 20 Nov 2025 362nd roavin 645 194 348ms 26 May 2022 363rd inventshah 645 220 391ms 13 May 2022 364th Shanethegamer 🇺🇸 643 125 1,208ms 11 May 2022 364th stefangimmillaro 643 125 1,021ms 15 Jul 2023 366th Shanethegamer 🇺🇸 643 147 4ms 11 May 2022 367th MeWhenI 🇻🇦 643 204 366ms 26 Aug 2023 368th edsrzf 🇳🇿 643 213 40ms 30 Dec 2024 369th MeWhenI 🇻🇦 641 189 431ms 23 Jun 2024 370th ovs-code 🇩🇪 640 85 175ms 23 May 2025 371st bac0id 640 193 459ms 29 Jun 2024 372nd m-tkach 🇺🇦 637 273 65ms 7 Feb 2023 373rd ovs-code 🇩🇪 634 82 38ms 10 Jun 2024 374th GrayJoKing 🇦🇺 634 149 5ms 20 May 2022 374th DialFrost 🇸🇬 634 149 4ms 15 Jan 2024 376th DialFrost 🇸🇬 633 139 7ms 1 Nov 2023 377th scpchicken 🇵🇼 633 247 229ms 4 Feb 2023 378th KrausRaus 🇺🇸 632 131 10ms 12 May 2022 379th annaproxy 632 198 325ms 10 May 2022 380th GrayJoKing 🇦🇺 632 268 20ms 14 days ago 381st targrik 630 150 6ms 24 Jan 2025 382nd primo-ppcg 🇹🇭 628 182 95ms 28 May 2022 383rd yzhs 🇩🇪 628 198 143ms 23 Jun 2022 384th CaedenHarper 🇨🇦 628 199 377ms 17 Oct 2025 385th SirBogman 🇺🇸 627 83 33ms 14 May 2022 385th janlelis 627 83 98ms 21 Sep 2024 387th AlephSquirrel 627 121 422ms 21 Jan 2024 388th bac0id 625 172 1ms 29 Jun 2024 389th AlephSquirrel 623 130 30ms 21 Jul 2022 390th stefangimmillaro 622 133 10ms 19 Sep 2024 391st janbehrens 🇩🇪 622 152 7ms 3 Jul 2023 392nd Ripick 622 211 376ms 18 Aug 2024 393rd GrayJoKing 🇦🇺 621 106 3ms 20 May 2022 394th tomh1012 619 202 373ms 14 Nov 2025 395th edsrzf 🇳🇿 619 212 371ms 23 Jul 2025 396th DialFrost 🇸🇬 619 251 2ms 26 May 2024 397th CaedenHarper 🇨🇦 618 134 9ms 6 Nov 2025 398th c0d3-4-F00d 🇩🇪 614 175 2ms 23 May 2022 399th Yewzir 🇧🇪 614 345 1,685ms 24 May 2024 400th nwellnhof 🇩🇪 612 85 35ms 20 May 2022 First Prev 321–400 of 700 Next Last