The 105 (number) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

105 (number)

105 is the natural number following 104 and preceding 106. It is the double factorial of 7.

List of numbers — Integers << 100 101 102 103 104 105 106 107 108 109 >>
Cardinal	one hundred [and] five
Ordinal	105th
Factorization
Divisors	3, 5, 7, 15, 21, 35
Roman numeral	CV
Binary	1101001
Hexadecimal	69

In mathematics

One hundred five is a triangular number and a dodecagonal number as well as a sphenic number and a Zeisel number. This is one of the few odd numbers to be immediately surrounded on both sides by pairs of twin primes (101 and 103, below, and 107 and 109 above). The only other such odds less than a thousand are 15, 195 and 825.

One hundred five is also a number n for which is prime, for . (This even works up to , ignoring the negative sign.)

In other fields

One hundred five is also:

• The atomic number of hahnium, also known as dubnium.
• The designation of some spur routes of Interstate 5.
• A film format introduced by Kodak for their first folding camera. See 120_film.
• The year AD 105 or 105 BC.

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