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 641st Babafaba 363 209 537ms 30 Oct 2025 642nd MeWhenI 🇻🇦 363 315 116ms 23 Jun 2024 643rd KatieLG 🇬🇧 362 194 12ms 23 Oct 2022 644th bakkeby 361 244 6ms 28 Sep 2022 645th KatieLG 🇬🇧 360 365 338ms 1 Nov 2022 646th KatieLG 🇬🇧 349 230 1,072ms 14 May 2022 647th JOrE20 🇺🇸 345 240 10ms 18 days ago 648th NoneTheFewer 339 239 10ms 18 May 2024 649th TheZwierzLF 🇵🇱 338 154 34ms 4 days ago 650th MeWhenI 🇻🇦 328 379 143ms 8 May 2022 651st ravnskjaer 🇩🇰 321 442 351ms 5 days ago 652nd AtengChen 317 255 11ms 24 Aug 2024 653rd chunes3 🇺🇸 317 348 71ms 14 Sep 2023 654th KatieLG 🇬🇧 313 250 221ms 13 May 2022 655th mathisfun271 312 259 12ms 4 Feb 2024 656th sidok 311 252 238ms 10 Aug 2024 657th ComputerKWasTaken 🇺🇸 310 261 16ms 9 Jun 2024 658th MeWhenI 🇻🇦 308 342 2ms 31 Dec 2022 659th MeWhenI 🇻🇦 306 599 893ms 28 Jul 2025 660th KatieLG 🇬🇧 305 387 280ms 1 Oct 2022 661st yzhs 🇩🇪 298 263 371ms 31 May 2022 662nd Bananapants22 298 272 10ms 8 Sep 2022 663rd JOrE20 🇺🇸 296 538 112ms 13 days ago 664th Zhenyu-Bo 287 282 11ms 31 Jul 2025 665th dylanjones92 279 290 10ms 26 Jan 2024 666th madex 🇩🇪 278 291 10ms 8 May 2024 667th MeWhenI 🇻🇦 275 198 309ms 25 May 2022 668th iczelia 🇩🇪 271 305 10ms 23 Oct 2025 669th gsprochette 264 306 16ms 21 Aug 2025 670th KatieLG 🇬🇧 261 483 665ms 2 Oct 2022 671st cros107 🇦🇺 260 311 10ms 9 Sep 2025 672nd Msleizak 🇫🇷 254 314 267ms 28 Dec 2023 673rd KatieLG-Transpiler 🇬🇧 244 539 335ms 2 Jul 2022 674th KatieLG-Transpiler 🇬🇧 240 492 275ms 25 Sep 2022 675th shibacho 🇯🇵 232 349 17ms 16 Nov 2022 676th aksyristos 228 228 38ms 12 Feb 2024 677th KatieLG-Transpiler 🇬🇧 217 582 673ms 10 Jul 2022 678th 104210 209 388 10ms 26 Aug 2022 679th KatieLG-Transpiler 🇬🇧 209 509 101ms 5 Nov 2022 680th MeWhenI 🇻🇦 207 1,662 18ms 28 Jul 2025 681st Natanaelel 🇸🇪 202 235 33ms 17 Jul 2023 682nd KatieLG 🇬🇧 201 529 108ms 6 Jan 2023 683rd KatieLG-Transpiler 🇬🇧 196 412 10ms 23 Jun 2022 684th gifti258 195 565 73ms 15 Sep 2023 685th Upload-and-View 🇺🇦 192 421 11ms 25 Jul 2025 686th KatieLG 🇬🇧 187 759 551ms 24 Jan 2023 687th KatieLG-Transpiler 🇬🇧 183 453 9ms 2 Nov 2022 688th arctouch-cristiannevianna 181 689 343ms 27 Jan 2023 689th KatieLG-Transpiler 🇬🇧 176 444 306ms 23 Jun 2022 690th KatieLG-Transpiler 🇬🇧 147 354 35ms 3 Jul 2022 691st lyphyser 143 752 2ms 18 Jul 2023 692nd MeWhenI 🇻🇦 135 352 35ms 11 May 2022 693rd KatieLG 🇬🇧 119 1,310 259ms 15 Sep 2024 694th AidanWalter 114 709 10ms 3 Jan 2025 695th KatieLG 🇬🇧 98 633 3ms 15 Sep 2024 696th KatieLG 🇬🇧 66 1,327 3ms 15 Sep 2024 697th ovs-code 🇩🇪 0 63 25ms 16 Feb 2025 698th aiwana 0 86 12ms 13 Oct 2025 699th edsrzf 🇳🇿 0 234 172ms 10 Feb 2025 700th albanian-laundromat 0 255 3ms 4 Jul 2025 First Prev 641–700 of 700
