The 71 (number) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

71 (number)

71 is the natural number following 70 and preceding 72.

List of numbers — Integers << 70 71 72 73 74 75 76 77 78 79 >>
Cardinal	seventy-one
Ordinal	71st (seventy-first)
Factorization
Roman numeral	LXXI
Binary	1000111
Hexadecimal	47

Mathematics

It is the 20th prime number. The next is seventy-three, with which it comprises a twin prime. It is also a permutable prime with seventeen. If we add up the primes less than 71 (2 through 67), we get 568, which is divisible by 71, 8 times.

Other fields

Seventy-one is also:

• The atomic number of lutetium, a lanthanide.
• The designation of USA Interstate 71, which runs from Kentucky to Ohio.
• The registry of the U.S. Navy's nuclear aircraft carrier USS Theodore Roosevelt (CVN-71), named after U.S. President Theodore Roosevelt.
• The number of the French department Saône-et-Loire.
• The year AD 71, 71 BC, or 1971.

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