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 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 641st ComputerKWasTaken 🇺🇸 425 261 16ms 9 Jun 2024 642nd 0dyse 423 293 104ms 12 May 2025 643rd JRaspass 🇬🇧 422 157 3ms 8 May 2022 644th pschmid0 🇺🇸 422 225 4ms 29 Sep 2022 645th guilhem-roy 🇫🇷 420 259 2ms 9 May 2022 646th msbranicky 417 207 270ms 20 Jan 2024 647th Bananapants22 408 272 10ms 8 Sep 2022 648th KatieLG 🇬🇧 407 313 10ms 17 Apr 2024 649th msbranicky 403 293 4,097ms 11 Jan 2025 650th aDwarfNamedUrist 397 266 2ms 30 Oct 2023 651st Zhenyu-Bo 394 282 11ms 31 Jul 2025 652nd MeWhenI 🇻🇦 388 122 3ms 11 May 2022 653rd adamnielson42 🇺🇸 386 215 10ms 26 Apr 2023 654th dylanjones92 383 290 10ms 26 Jan 2024 655th madex 🇩🇪 382 291 10ms 8 May 2024 656th 4hg 🇺🇸 370 130 33ms 28 Jul 2023 657th madex 🇩🇪 370 294 2ms 8 May 2024 658th KatieLG 🇬🇧 365 194 12ms 23 Oct 2022 659th MeWhenI 🇻🇦 365 198 309ms 25 May 2022 660th gsprochette 363 306 16ms 21 Aug 2025 661st KatieLG 🇬🇧 361 365 338ms 1 Nov 2022 662nd cros107 🇦🇺 357 311 10ms 9 Sep 2025 663rd KatieLG 🇬🇧 351 230 1,072ms 14 May 2022 664th JOrE20 🇺🇸 346 240 10ms 17 days ago 665th KatieLG 🇬🇧 344 251 221ms 13 May 2022 666th sidok 342 253 238ms 10 Aug 2024 667th aksyristos 330 228 38ms 12 Feb 2024 668th yzhs 🇩🇪 329 263 371ms 31 May 2022 669th MeWhenI 🇻🇦 329 379 143ms 8 May 2022 670th ravnskjaer 🇩🇰 322 442 351ms 3 days ago 671st chunes3 🇺🇸 318 348 71ms 14 Sep 2023 672nd shibacho 🇯🇵 318 349 17ms 16 Nov 2022 673rd MeWhenI 🇻🇦 309 342 2ms 31 Dec 2022 674th MeWhenI 🇻🇦 307 599 893ms 28 Jul 2025 675th KatieLG 🇬🇧 305 387 280ms 1 Oct 2022 676th JOrE20 🇺🇸 297 538 112ms 11 days ago 677th 104210 286 388 10ms 26 Aug 2022 678th iczelia 🇩🇪 272 305 10ms 23 Oct 2025 679th KatieLG-Transpiler 🇬🇧 270 412 10ms 23 Jun 2022 680th Upload-and-View 🇺🇦 264 421 11ms 25 Jul 2025 681st KatieLG 🇬🇧 262 483 665ms 2 Oct 2022 682nd Msleizak 🇫🇷 258 314 267ms 28 Dec 2023 683rd KatieLG-Transpiler 🇬🇧 244 539 335ms 2 Jul 2022 684th KatieLG-Transpiler 🇬🇧 240 492 275ms 25 Sep 2022 685th KatieLG-Transpiler 🇬🇧 218 582 673ms 10 Jul 2022 686th KatieLG-Transpiler 🇬🇧 213 354 35ms 3 Jul 2022 687th KatieLG-Transpiler 🇬🇧 210 509 101ms 5 Nov 2022 688th MeWhenI 🇻🇦 207 1,662 18ms 28 Jul 2025 689th Natanaelel 🇸🇪 205 235 33ms 17 Jul 2023 690th KatieLG 🇬🇧 202 529 108ms 6 Jan 2023 691st gifti258 196 565 73ms 15 Sep 2023 692nd KatieLG-Transpiler 🇬🇧 194 445 306ms 23 Jun 2022 693rd KatieLG 🇬🇧 187 759 551ms 24 Jan 2023 694th KatieLG-Transpiler 🇬🇧 183 453 9ms 2 Nov 2022 695th arctouch-cristiannevianna 182 689 343ms 27 Jan 2023 696th AidanWalter 157 709 10ms 3 Jan 2025 697th lyphyser 145 752 2ms 18 Jul 2023 698th MeWhenI 🇻🇦 137 352 35ms 11 May 2022 699th KatieLG 🇬🇧 120 1,310 259ms 15 Sep 2024 700th KatieLG 🇬🇧 99 633 3ms 15 Sep 2024 701st KatieLG 🇬🇧 90 1,327 3ms 15 Sep 2024 702nd ovs-code 🇩🇪 0 129 25ms 16 Feb 2025 703rd aiwana 0 156 12ms 16 Oct 2025 704th edsrzf 🇳🇿 0 235 172ms 10 Feb 2025 705th albanian-laundromat 0 255 3ms 4 Jul 2025 First Prev 641–705 of 705
