Here are some tricks to learn more than 300 decimals of pi (very little more).
Anagrams (or mirrored in LED)
Bubblesort, big numbers first.
3.
14 15 926
535
8
979 323
8
46264
3
383
2+7=9
502
88
4
1971 69
3993
751
05820
97 (prime)
494
4+5=9
23 (prime, Lost Number)
0781
64
(0,62,8) (62,0,8)
998
(62,8,0)
348 (one below prime)
2-5=-3
42
11
70
67 (prime)
98
214 8086 513
282 3
0 66 47(First of three sorted strings starting with 0)
0 93 8=4+4 6 (Second sorted string)
0 955 0 (Third sorted string)
58 (22,31,72) 535 94 0
81 28 48 111
74 50 28
410 2701
93 852 (keypad middle) 110 555
9 6446 22 9
48
9 5+4 9 303 8+1=9
64 42 88 (even digits)
109 7 (prime numbers)
5665 9
33 44 612 84 756 48
23 37 86 783 16 52 71 20
19091 456 48
566 9
234 603 486 10 454 32 66 48
2+1=3 393
60 72 60 24 9
141 27372
Intel 4004[Wikipedia], the world's first microprocessor on a chip was released in 1971.