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Chronology
 

The 50 functions are here listed in order of the year of their conception. They are dated from published sources and, absent that, from memory.

1962     0. Array Logic [8a]
1963 5. Parentheses Nesting [22]
1967 8. Pascal’s Triangle [33]
1968 4. Bar Chart [19]
21. Permutation Index [75]
1971 6. Perfect Shuffle [14]
197528. Odometer
197627. moo
197930. Dyadic Transpose [92]
198020. Inverse Permutation [3b]
198119. Permutations [70]
22. Combinations [70]
25. N Queens Problem [70]
41. Cholesky Decomposition [116]
47. Pyramigram [129]
1982 2. A Short Average [14]
198712. Cayley’s Theorem [49a]
13. Symmetries of the Square [49a]
14. Interval Index [49b]
29. Array Indexing [49e]
35. Transitive Closure [49b]
1989 1. On Average
1990 9. Golden Ratio [34b]
11. Inner Product [45]
199233. Josephus Problem [101]
39. Ackermann’s Function [101]
1993 7. Quicksort
199543. Stirling Numbers [119]
44. Chinese Remainder Theorem [121]
199642. Minors
200324. Symmetric Array [82]
200438. Tower of Hanoi [107]
200515. Central Limit Theorem [135]
23. Combination Index [79]
34. Repeated Squaring [102]
36. Fibonacci Numbers [43]
37. Gray Code [106]
200616. A Memo Operator [59]
48. Monty Hall Problem [133]
200710. Newton’s Method [44]
18. 88 Hats [67]
31. Inverted Table Index-Of [94]
200917. 1729 [63]
201026. Knight’s Tour [86]
32. Fast Multiplication [97]
45. Euler’s Identity [125]
49. Bring Something Beautiful [134]
2014 3. Index-Of Selfie [15]
201640. Halting Problem [110]
46. 50847534 [127]