How can I love numbers
Pay please! 143 and other significant numbers
On February 14 of all things the number 143 for "Pay, please!"? This is neither a typo, nor are we a month early to celebrate π-Day (3/14).
But then what could be exciting about the 143? She's not even prime. Okay, the 143 can at least be written as the sum of 7 consecutive prime numbers (11 + 13 + 17 + 19 + 23 + 29 + 31) and also plays a role in Waring's problem (A018886): Every natural number can be a sum of at most Write 143 powers of seven (by the way, 2175 is the smallest number that needs all 143 summands). But that's not the reason to look at the 143 today.
Coded love message
In fact, on February 14th, it should be one of the most frequently typed numbers in chats, especially in the English-speaking world, because the individual digits stand for the number of letters in "I Love You"
To emphasize the statement, some also use 286, ie 2 × 143 = "I Love You, I Love You" or according to the same scheme 143637 ("I Love You Always And Forever"). The 831 (also 381) means the same as 143, but formulates it differently: "8 letters, 3 words, one meaning". Those who grew up with button cell phones like to type 459 into the chat window instead (see picture).
But now, no more emotionalism, we also have a heart for haters: "-143" negates the statement, so means "I Hate You" - just like 182: The 1 stands for an "I"; 82 uses the similarities between "Eight Two" and "Hate You".
Internet slang: meaningful numbers
Even without the use of additional letters or special characters, you can pack all kinds of emotions and meanings in numbers. Here is a definitely incomplete list of numbers that can sometimes have unexpected meanings for one or the other participant in (primarily English-speaking) chats:
- 5 - "LOL" in Leetspeak is often represented as 101, which, interpreted as a binary number, corresponds to a decimal 5.
- 9 - "Parents / others are watching, I'm not alone", also 911 (actually 9 !!, see also 111)
- 86 - "Get rid of, quit, reject"; however, the actual origin of the term is unclear.
- 101 - "Basics, Introduction": Derives from the course names at colleges and universities in which the basics are taught.
- 111 - "Excited" so much that you forget the shift key for !!! to press (see also! 1! 111elf! ;-)
- 120 - stands for "LOL!" (Laughing Out Loud! ") And can only come from mathematicians (or physicists): LOL in lower case looks like 101; interpreting this in binary and the"! "As the factorial symbol results in 5! = 120.
- 121 - "One to One", the invitation to a one-on-one interview
- 220 - "Incomparable": comes from "Second"  "to"  "None" 
- 224 - "Today, Tomorrow, Always" - is derived from the prefixes of the words "Today" , "Tomorrow" , "Forever" .
- 247 - "around the clock", i.e. 24 hours, 7 days a week
- 333 - "half bad", half of 666 (see below)
- 404 - "No idea, I don't understand" based on the HTTP error message "Page Not Found"
- 411 - Request for information (based on the telephone number of the US information desk)
- 666 - "Evil, diabolical": comes from the number of the beast ("Number Of The Beast") or number of the Antichrist
- 721 - "Liebe Dich": derives from "Love You", "7 letters, 2 words, one meaning"
- 730 - "Crazy, freaked out": comes from US legislation (Criminal Procedure Law Section 730) to test mental health
- 823 - "Think of you": Number of letters in "Thinking"  "Of"  "You" 
- 1337 - "Elite" doesn't have to be explained at heise online :-D
- 4377 - "Hell" in Leetspeak
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