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Information About

105 (number)






Cardinal one hundred {Link without Title}
five
Ordinal 105th
Factorization 3 \cdot 5 \cdot 7
Divisor s 3, 5, 7, 15, 21, 35
Roman Numeral CV
Binary 1101001
Hexadecimal 69



IN MATHEMATICS

105 is the Double Factorial of 7 .
105 is a Triangular Number and a 12 -gonal Number as well as a Sphenic Number and a Zeisel Number . It comes in the middle of the Prime Quadruplet (101, 103, 107, 109). The only other such odd numbers less than a thousand are 15, 195 and 825. 105 is also a Pseudoprime to the prime bases: 13, 29, 41, 43, 71, 83 and 97.

One hundred five is also a number ''n'' for which n - 2^k is prime, for k < log_2(n). (This even works up to k = 8, ignoring the negative sign.)


IN SCIENCE


In Astronomy ,

: Messier Object M105 , a Magnitude 11.0 Elliptical Galaxy in the Constellation Leo

: The , a magnitude 13.2 Spiral Galaxy in the constellation Pisces

: Asteroid 105 Artemis

:The series which began on 499 March 27 and ended on 1779 May 16 . The duration of Saros series 105 was 1280.1 years, and it contained 72 solar eclipses.

:The Saros number of the Lunar Eclipse series which began on 566 August 16 and ended on 1882 October 26 . The duration of Saros series 105 was 1316.2 years, and it contained 74 lunar eclipses.

IN OTHER FIELDS

105 is also: