The Calendar hole will go live in approximately 13 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 MeWhenI 🇻🇦 363 315 116ms 23 Jun 2024 642nd KatieLG 🇬🇧 362 194 12ms 23 Oct 2022 643rd bakkeby 361 244 6ms 28 Sep 2022 644th KatieLG 🇬🇧 360 365 338ms 1 Nov 2022 645th KatieLG 🇬🇧 349 230 1,072ms 14 May 2022 646th JOrE20 🇺🇸 345 240 10ms 16 days ago 647th NoneTheFewer 339 239 10ms 18 May 2024 648th TheZwierzLF 🇵🇱 338 154 34ms 2 days ago 649th MeWhenI 🇻🇦 328 379 143ms 8 May 2022 650th ravnskjaer 🇩🇰 321 442 351ms 3 days ago 651st AtengChen 317 255 11ms 24 Aug 2024 652nd chunes3 🇺🇸 317 348 71ms 14 Sep 2023 653rd KatieLG 🇬🇧 313 250 221ms 13 May 2022 654th mathisfun271 312 259 12ms 4 Feb 2024 655th sidok 311 252 238ms 10 Aug 2024 656th ComputerKWasTaken 🇺🇸 310 261 16ms 9 Jun 2024 657th MeWhenI 🇻🇦 308 342 2ms 31 Dec 2022 658th MeWhenI 🇻🇦 306 599 893ms 28 Jul 2025 659th KatieLG 🇬🇧 305 387 280ms 1 Oct 2022 660th JOrE20 🇺🇸 300 538 112ms 10 days ago 661st yzhs 🇩🇪 298 263 371ms 31 May 2022 662nd Bananapants22 298 272 10ms 8 Sep 2022 663rd Zhenyu-Bo 287 282 11ms 31 Jul 2025 664th dylanjones92 279 290 10ms 26 Jan 2024 665th madex 🇩🇪 278 291 10ms 8 May 2024 666th MeWhenI 🇻🇦 275 198 309ms 25 May 2022 667th iczelia 🇩🇪 271 305 10ms 23 Oct 2025 668th gsprochette 264 306 16ms 21 Aug 2025 669th KatieLG 🇬🇧 261 483 665ms 2 Oct 2022 670th cros107 🇦🇺 260 311 10ms 9 Sep 2025 671st Msleizak 🇫🇷 254 314 267ms 28 Dec 2023 672nd KatieLG-Transpiler 🇬🇧 244 539 335ms 2 Jul 2022 673rd KatieLG-Transpiler 🇬🇧 240 492 275ms 25 Sep 2022 674th shibacho 🇯🇵 232 349 17ms 16 Nov 2022 675th aksyristos 228 228 38ms 12 Feb 2024 676th KatieLG-Transpiler 🇬🇧 217 582 673ms 10 Jul 2022 677th 104210 209 388 10ms 26 Aug 2022 678th KatieLG-Transpiler 🇬🇧 209 509 101ms 5 Nov 2022 679th MeWhenI 🇻🇦 207 1,662 18ms 28 Jul 2025 680th Natanaelel 🇸🇪 202 235 33ms 17 Jul 2023 681st KatieLG 🇬🇧 201 529 108ms 6 Jan 2023 682nd KatieLG-Transpiler 🇬🇧 196 412 10ms 23 Jun 2022 683rd gifti258 195 565 73ms 15 Sep 2023 684th Upload-and-View 🇺🇦 192 421 11ms 25 Jul 2025 685th KatieLG 🇬🇧 187 759 551ms 24 Jan 2023 686th KatieLG-Transpiler 🇬🇧 183 453 9ms 2 Nov 2022 687th arctouch-cristiannevianna 181 689 343ms 27 Jan 2023 688th KatieLG-Transpiler 🇬🇧 176 444 306ms 23 Jun 2022 689th KatieLG-Transpiler 🇬🇧 147 354 35ms 3 Jul 2022 690th lyphyser 143 752 2ms 18 Jul 2023 691st MeWhenI 🇻🇦 135 352 35ms 11 May 2022 692nd KatieLG 🇬🇧 119 1,310 259ms 15 Sep 2024 693rd AidanWalter 114 709 10ms 3 Jan 2025 694th KatieLG 🇬🇧 98 633 3ms 15 Sep 2024 695th KatieLG 🇬🇧 66 1,327 3ms 15 Sep 2024 696th ovs-code 🇩🇪 0 63 25ms 16 Feb 2025 697th aiwana 0 86 12ms 13 Oct 2025 698th edsrzf 🇳🇿 0 234 172ms 10 Feb 2025 699th albanian-laundromat 0 255 3ms 4 Jul 2025 First Prev 641–699 of 699
