29 (number) - Wikipedia
https://en.wikipedia.org/wiki/29_(number)
Web29 is a Perrin number, preceded in the sequence by 12, 17, 22. 29 is the smallest positive whole number that cannot be made from the numbers {1, 2, 3, 4}, using each exactly once and using only addition, subtraction, multiplication, and division. 29 is the number of pentacubes if reflections are considered distinct.
DA: 27 PA: 38 MOZ Rank: 29