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 401st dokutan 612 224 41ms 31 Aug 2024 402nd inventshah 611 128 300ms 6 Nov 2022 403rd SirBogman 🇺🇸 610 419 18ms 27 Dec 2023 404th zakariamouhid 609 136 13ms 11 May 2023 404th gigaprofisi 🇺🇸 609 136 10ms 10 Aug 2025 406th IanUtley 609 188 119ms 15 Nov 2023 407th GolfingSuccess 🇬🇷 607 61 48ms 14 Aug 2022 408th anter69 🇭🇺 605 86 55ms 13 Feb 2024 409th anter69 🇭🇺 604 133 983ms 16 Feb 2023 410th Natanaelel 🇸🇪 604 206 135ms 9 May 2022 410th annaproxy 604 206 142ms 3 Jun 2022 412th SirBogman 🇺🇸 604 235 1,296ms 26 May 2022 413th MeWhenI 🇻🇦 602 165 10ms 16 Aug 2024 414th stefangimmillaro 602 213 44ms 15 Jul 2023 415th MeWhenI 🇻🇦 602 239 7ms 23 Jun 2024 416th tobeannouncd 601 207 137ms 2 Jan 2024 417th klixel 🇨🇦 601 260 211ms 9 Jun 2023 418th MeWhenI 🇻🇦 600 117 9ms 18 May 2022 419th 5cw 🇺🇸 600 135 12ms 4 May 2025 419th Babafaba 600 135 17ms 7 Sep 2025 421st annaproxy 600 191 19ms 23 Oct 2022 422nd jared-hughes 597 106 23ms 19 Jul 2022 423rd SirBogman 🇺🇸 597 192 117ms 6 Oct 2025 424th MeWhenI 🇻🇦 596 149 754ms 15 Sep 2025 425th MeWhenI 🇻🇦 596 215 41ms 23 Jun 2024 426th emgordon154 595 167 15ms 27 Aug 2024 427th GrayJoKing 🇦🇺 591 88 42ms 25 Oct 2023 428th hamhub7 590 212 338ms 8 Aug 2022 429th dokutan 589 181 13ms 1 Jul 2024 430th inventshah 588 129 562ms 21 Jan 2024 431st lynn 586 138 10ms 4 Jun 2022 432nd SirBogman 🇺🇸 585 219 44ms 4 Nov 2024 433rd Yewzir 🇧🇪 584 202 281ms 27 Oct 2023 434th MeWhenI 🇻🇦 582 137 291ms 29 Jan 2023 435th Yewzir 🇧🇪 582 215 363ms 22 Dec 2024 436th retrohun 581 109 16ms 12 Oct 2024 437th eranws 579 143 10ms 23 Oct 2022 437th AlephSquirrel 579 143 9ms 21 Dec 2022 439th Shanethegamer 🇺🇸 578 90 35ms 12 May 2022 440th jared-hughes 578 140 11ms 19 Jul 2022 440th ryyyn 🇺🇸 578 140 29ms 13 Nov 2025 442nd DialFrost 🇸🇬 576 178 2ms 29 Jan 2024 443rd two-bad 🇬🇧 575 144 10ms 9 Feb 2024 444th rifatx 575 205 269ms 23 Jul 2024 445th Yewzir 🇧🇪 575 215 2,635ms 7 May 2024 446th emgordon154 574 140 1,010ms 25 Nov 2024 447th cingulataluke 574 141 11ms 27 Aug 2023 447th MeWhenI 🇻🇦 574 141 11ms 22 May 2024 447th bizy-coder 574 141 29ms 22 days ago 450th Yewzir 🇧🇪 571 297 17ms 22 Dec 2024 451st GolfingSuccess 🇬🇷 570 133 518ms 20 Jan 2024 452nd GolfingSuccess 🇬🇷 570 142 11ms 21 May 2022 453rd msbranicky 570 274 251ms 1 Oct 2023 454th MeWhenI 🇻🇦 569 166 4ms 28 May 2023 455th SirBogman 🇺🇸 569 185 2ms 21 May 2022 456th janbehrens 🇩🇪 567 138 342ms 12 May 2022 457th coreynash 567 146 10ms 19 Oct 2023 457th alexsave 567 146 10ms 15 Nov 2025 459th martinnorling 🇸🇪 566 124 9ms 13 May 2022 460th MeWhenI 🇻🇦 566 307 56ms 23 Jun 2024 461st alphafalfa 564 110 6ms 25 Oct 2024 462nd Schmitt-Very-Cool 563 252 450ms 30 Sep 2025 463rd emgordon154 563 376 1,678ms 17 Sep 2025 464th SirBogman 🇺🇸 562 135 688ms 16 Jan 2024 465th yzhs 🇩🇪 562 144 17ms 31 May 2022 466th GrayJoKing 🇦🇺 561 126 139ms 24 Oct 2024 466th rucin93 🇵🇱 561 126 133ms 3 Jan 2025 468th bac0id 561 223 373ms 29 Jun 2024 469th the-zammers 560 222 146ms 15 Oct 2023 470th DialFrost 🇸🇬 558 143 263ms 16 Jun 2024 471st bac0id 558 191 97ms 29 Jun 2024 472nd emgordon154 558 220 4ms 3 Jan 2025 473rd MeWhenI 🇻🇦 557 157 23ms 23 Jun 2024 474th MeWhenI 🇻🇦 555 141 371ms 23 Jun 2024 475th Command-Master 554 146 18ms 29 Sep 2023 476th 386asm 🇺🇸 554 214 39ms 4 May 2023 477th SirBogman 🇺🇸 553 86 34ms 9 Jan 2023 478th tatzyr 🇯🇵 553 94 40ms 24 Nov 2024 479th Shanethegamer 🇺🇸 552 283 220ms 11 May 2022 480th lifthrasiir 🇰🇷 551 85 4ms 27 Nov 2024 First Prev 401–480 of 700 Next Last