The Calendar hole will go live in approximately 10 days. Why not try and solve it ahead of time?
Jacobi Symbol in all languages in bytes. 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 Bytes Time Submitted 401st CatsAreFluffy 655 166 2ms 25 Jan 2023 401st Alex-x90 🇺🇸 655 166 2ms 14 Dec 2023 403rd janbehrens 🇩🇪 655 217 456ms 3 Jul 2023 404th Sakisan 🇧🇪 654 127 9ms 12 May 2022 404th janbehrens 🇩🇪 654 127 10ms 3 Jul 2023 406th Shanethegamer 🇺🇸 654 241 7ms 4 Oct 2024 407th Alex-x90 🇺🇸 653 170 18ms 15 Dec 2023 407th TheZwierzLF 🇵🇱 653 170 18ms 22 May 2025 409th CatsAreFluffy 653 190 79ms 30 Dec 2022 410th MeWhenI 🇻🇦 652 124 978ms 25 May 2022 411th Shanethegamer 🇺🇸 652 135 21ms 12 May 2022 412th duckyluuk 🇳🇱 650 151 460ms 19 Jun 2024 412th bizy-coder 650 151 603ms 23 days ago 414th snoozingnewt 🇨🇦 650 195 112ms 20 Nov 2025 415th olleicua 🇺🇸 649 116 39ms 19 Feb 2025 416th itsh01 649 128 9ms 4 Jul 2022 417th Shanethegamer 🇺🇸 647 125 1,208ms 11 May 2022 417th stefangimmillaro 647 125 1,021ms 15 Jul 2023 419th roavin 647 194 348ms 26 May 2022 420th Shanethegamer 🇺🇸 646 147 4ms 11 May 2022 421st SniperSmiley 🇺🇸 646 172 17ms 29 Jun 2022 421st adoxography 646 172 18ms 8 Aug 2022 421st SB-945 646 172 17ms 24 Jan 2024 424th MichalMarsalek 🇨🇿 646 204 356ms 20 May 2022 424th MeWhenI 🇻🇦 646 204 366ms 26 Aug 2023 426th inventshah 646 220 391ms 13 May 2022 427th MeWhenI 🇻🇦 644 189 431ms 23 Jun 2024 428th neel11235813 642 153 588ms 27 Mar 2024 429th neihousaigaai 642 173 12ms 17 May 2022 430th bac0id 642 193 459ms 29 Jun 2024 431st dmrichwa 🇺🇸 639 130 10ms 15 Jun 2022 432nd m-tkach 🇺🇦 639 273 65ms 7 Feb 2023 433rd GrayJoKing 🇦🇺 638 149 5ms 20 May 2022 433rd DialFrost 🇸🇬 638 149 4ms 15 Jan 2024 435th Bonjour27891 🇻🇳 638 174 17ms 5 Jul 2022 436th croc54 635 175 17ms 8 Jan 2025 437th GrayJoKing 🇦🇺 635 268 20ms 15 days ago 438th KrausRaus 🇺🇸 634 131 10ms 12 May 2022 439th scpchicken 🇵🇼 634 247 229ms 4 Feb 2023 440th targrik 633 150 6ms 24 Jan 2025 441st annaproxy 633 198 325ms 10 May 2022 442nd Shanethegamer 🇺🇸 631 137 423ms 9 May 2022 443rd MichalMarsalek 🇨🇿 631 176 10ms 20 May 2022 443rd dokutan 631 176 10ms 23 Jun 2024 443rd RaBa21 🇭🇺 631 176 16ms 19 Jul 2025 446th yzhs 🇩🇪 631 198 143ms 23 Jun 2022 447th CaedenHarper 🇨🇦 630 199 377ms 17 Oct 2025 448th bac0id 628 173 1ms 29 Jun 2024 449th fgrosshans 🇫🇷 627 177 10ms 3 Nov 2022 450th GrayJoKing 🇦🇺 626 106 3ms 20 May 2022 451st janbehrens 🇩🇪 626 138 342ms 12 May 2022 452nd stefangimmillaro 625 133 10ms 19 Sep 2024 453rd janbehrens 🇩🇪 625 152 7ms 3 Jul 2023 454th MaxElf999 624 178 18ms 27 Sep 2022 454th za3k 624 178 10ms 14 Dec 2022 454th jmerle 🇳🇱 624 178 18ms 11 Jul 2023 457th Ripick 624 211 376ms 18 Aug 2024 458th anter69 🇭🇺 623 121 34ms 7 Jan 2024 459th MeWhenI 🇻🇦 621 148 140ms 25 Oct 2024 460th c0d3-4-F00d 🇩🇪 621 175 2ms 23 May 2022 461st tomh1012 621 202 373ms 14 Nov 2025 462nd edsrzf 🇳🇿 621 212 371ms 23 Jul 2025 463rd DialFrost 🇸🇬 621 251 2ms 26 May 2024 464th CaedenHarper 🇨🇦 620 134 9ms 6 Nov 2025 465th KatieLG 🇬🇧 618 159 483ms 15 Jan 2024 465th commandblockguy 🇺🇸 618 159 467ms 1 Sep 2025 465th TheZwierzLF 🇵🇱 618 159 606ms 27 days ago 468th Lv0Sys 🇵🇱 617 122 56ms 13 days ago 469th Yewzir 🇧🇪 615 345 1,685ms 24 May 2024 470th snoozingnewt 🇨🇦 614 160 505ms 1 Oct 2025 471st Eilonlif 🇮🇱 613 181 10ms 15 Feb 2024 472nd DialFrost 🇸🇬 612 123 51ms 1 Jun 2024 473rd IanUtley 612 188 119ms 15 Nov 2023 474th zakariamouhid 611 136 13ms 11 May 2023 474th gigaprofisi 🇺🇸 611 136 10ms 10 Aug 2025 476th SirBogman 🇺🇸 611 419 18ms 27 Dec 2023 477th JunkIce 610 161 529ms 3 Dec 2024 478th mbittner20 610 182 11ms 27 May 2023 478th rollershutter 610 182 10ms 4 Jul 2024 478th wh3n3v3r 🇨🇿 610 182 10ms 11 Nov 2024 First Prev 401–480 of 706 Next Last