420 (number) explained
420 (four hundred [and] twenty) is the natural number following 419 and preceding 421.
In mathematics
420 is:
- the sum of four consecutive primes (
).
In other fields
- 420 is a slang term that refers to the consumption of cannabis. April 20th is commonly celebrated as a holiday dedicated to the drug, due the day being notated as 4/20 in the month-day-year format. Because of these associations, 420 has been humorously referred to as the "weed number". "Weed" is a slang term for cannabis.
- 420 is the country calling code for Czech Republic.
Notes and References
- Web site: Sloane's A028442 : Numbers n such that Mertens' function is zero. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-06-02.
- Web site: Sloane's A036913 : Sparsely totient numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-06-02.
- Web site: Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-06-02.