122 (-a) × (-a) = a × a 2017-09-26T22:25:54.850

69 Machine Learning Golf: Multiplication 2019-07-02T11:38:39.713

44 Multiply with restricted operations 2014-09-01T20:03:44.447

39 Construct a pentagon avoiding compass use 2019-07-13T16:35:54.653

27 Calculate n % 12 2014-06-20T00:05:32.077

26 Is this number an exact power of -2: (Very) Hard Mode 2017-04-06T16:06:52.750

26 Google's doodle on kids coding: shortest program solving all the levels 2017-12-05T12:51:52.280

24 Shortest expression for {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4} 2014-07-16T21:46:37.600

21 Prove DeMorgan's laws 2016-10-16T08:13:41.340

20 Build a multiplying machine using NAND logic gates 2013-08-08T05:39:59.863

20 Determine if an integer is divisible by 3 2014-06-23T03:20:09.733

19 Write it into number theory style 2018-01-04T05:09:52.893

17 Find the maximum of 3 numbers without branching 2014-06-25T00:03:09.363

16 Google's Hopping Bunny 2017-12-18T18:32:04.747

15 Build a minifloat adding machine using NAND logic gates 2014-04-22T19:33:31.797

15 SKI calculus golf: Half of a Church numeral 2020-02-02T23:15:22.153

13 How to golf string output in Chef 2014-10-13T17:40:29.397

13 Hexcellent Minesweeping 2018-01-28T19:12:58.030

13 Densely packed decimal (DPD) to decimal, with logic gates 2018-11-26T00:27:26.390

12 Print NxN spiral of ascending numbers 2011-02-09T13:36:37.860

12 Encode a program with the fewest distinct characters possible, 2013-05-14T23:32:58.420

12 Implement an 8 bit adder 2014-08-30T00:00:51.843

12 Build a 4-vertex Connectedness Tester using NAND gates 2016-01-23T02:16:48.723

12 Find the password 2017-11-20T07:07:22.133

12 Get Two from One 2018-01-31T22:12:37.537

11 Build a bit-counting comparator using NAND logic gates 2014-04-08T14:56:04.590

11 Egg hunting in Collatz style 2018-03-29T19:33:28.840

10 Blind binary adder 2017-08-26T16:41:38.757

9 Build an EBCDIC converter using NAND logic gates 2014-04-24T14:53:04.517

9 Drive a hexadecimal 7-segment display using NAND logic gates 2014-09-11T18:23:44.183

9 "Atomic" code golf - determine the number of neutrons in an isotope 2014-12-10T04:37:15.420

8 Turtle Graphics Version 2 2014-03-07T20:38:43.287

8 Build a 2-way universal logic processor using NAND logic gates 2014-03-28T16:14:36.000

8 Collatz sequence on a two counter machine 2015-04-07T09:47:01.683

8 Sort a list of numbers on the λ-calculus 2015-08-24T05:40:55.840

8 Solve this uHerbert challenge 2017-05-12T15:21:42.843

7 Pretty Printing Parentheses 2013-02-17T05:12:27.740

7 Write a hash function for Morse Code 2014-01-31T12:31:15.807

7 Create a universal two-dimensional cellular automaton cell using two-way universal logic processors 2015-01-24T05:49:56.090

6 Build an adding machine using NAND logic gates 2013-03-07T20:41:19.567

6 Turtle Graphics Program 2014-01-10T03:53:19.687

6 Solve quadratic equation using only 3 variables and arithmetic 2014-08-12T14:55:45.103

6 Regular expression parser 2017-06-09T22:27:42.220

5 Box-256 Assembly - BIG SQUARE II 2016-04-14T19:34:25.310

5 Generate an expression yielding near-equidistributed result 2018-07-24T21:00:34.407

4 Build a NAND gate using multiple NAND gates 2013-08-05T03:50:25.097

4 draw ASCII function plots 2015-02-04T16:46:32.353

4 Copy Memory Only Using Store And Subtraction 2015-06-12T19:21:33.193

3 Count even steps of 196 algorithm 2011-02-15T00:22:45.397

3 Increment Bitwise 2014-06-22T07:23:00.330

3 Robot optimization 2015-12-16T18:26:58.387

2 Brainf*** code golf challenge - write a Brainf*** program that searches for the first non-zero cell 2015-08-10T15:57:36.197

2 Your very own "for" instruction, redux 2017-01-27T03:26:03.043

1 Meta-atomic code golf 2014-12-17T21:39:58.153

1 Converting rational numbers to an “alien” data format 2017-03-09T01:57:20.287

1 Rewrite the Tiny BASIC IL program to support 7 changes to BASIC 2017-04-25T02:11:11.963

0 Define map in the fewest tokens 2015-11-23T18:26:57.710

0 Tetration: (Very) Hard Mode 2017-04-06T19:10:49.943

-1 tree from string 2014-02-07T10:02:21.337

-3 Shortest test for primality for byte 2014-07-17T11:51:07.613

-3 Find the inverse of a matrix 2015-02-04T21:54:35.313

-3 What is the shortest LOOP program that outputs 2016? 2016-01-11T18:53:34.370

-3 Is there a Haskell function for calculating the power of one Integer to another? 2020-02-28T16:46:12.737

-4 Determine length of bitstring 2015-05-01T11:57:46.943

-5 Convert to uppercase and lowercase without branching and comparisons 2014-08-19T13:21:33.817