Seventy-three
| Seventy-three | |
|---|---|
| 73 | |
| presentation | |
| Roman | LXXIII |
| dual | 100 1001 |
| Octal | 111 |
| Duodecimal | 61 |
| Hexadecimal | 49 |
| Morse code | - - · · · · · - - - |
| Mathematical properties | |
| sign | positive |
| parity | odd |
| Factorization | |
| Divider | 73 |
The Seventy-three (73) is the natural number between 72 and 74. It is odd and a prime number .
mathematics
It is the 21st prime number and also a permutable prime number . Also, 73 is the 18th lucky number .
chemistry
73 is the atomic number of tantalum .
Meanings and connections
- 73 is an operational abbreviation for "Greetings" in the amateur radio service , which has its origins in its use as an operational abbreviation in telegraphy .
- Every natural number can be written as the sum of a maximum of 73 powers of order 6, see Waring's problem .
- 73 is the favorite number of Sheldon Lee Cooper from the series The Big Bang Theory . He justifies it in the (73rd) episode The Animal Amy as follows: The 73 is the 21st prime number, its mirror number - the 37 - is the 12th prime number. Its mirror number in turn - 21 - is the product of the multiplication of 7 and 3. It could be shown mathematically that 73 is actually the only number ("Sheldon Prime ") with these properties. In addition, 73 is a binary palindrome of numbers , since it is 1001001 written forwards and backwards. The Morse code is also mirror-symmetrical or point-symmetrical and can probably still be perceived as symmetry.
Web links
Commons : 73 (number) - Collection of pictures, videos and audio files
Individual evidence
- ↑ A000959 - OEIS. Retrieved April 2, 2020 .
- ↑ Operating abbreviations in amateur radio. (PDF; 6 kB) (No longer available online.) Archived from the original ; Retrieved September 14, 2012 .
- ↑ Eckart Moltrecht : Industrial Engineering / Regulations Chapter 4: Operational Abbreviations. German Amateur Radio Club , accessed September 13, 2015 .
- ↑ Big Bang Theory Inspires Mathematical Proof , Süddeutsche Zeitung, May 23, 2019
- ↑ Sheldon Lee Cooper was actually correct with the number 73 , Standard, May 24, 2019
- ↑ Volker Zota: Numbers, please! Is 73 the Best Number? on heise.de, August 8, 2017
- ↑ Big Bang Theory inspires mathematical proof
- ↑ Manon Bischoff: Mathematical discovery thanks to "Big Bang Theory". In: Spektrum KOMPAKT 06.19 , p. 13 ( online )
- ↑ Wiebelt, Alexandra .: Symmetry in writing systems. A legibility problem . Linguistic work volume 488 . Niemeyer, Tübingen 2004, ISBN 3-484-30488-X , p. 198 .