70 (number)

In mathematics

• a sphenic number because it factors as 3 distinct primes.
• a Pell number.
• the seventh pentagonal number.
• the fourth tridecagonal number.
• the fifth pentatope number.
• the number of ways to choose 4 objects out of 8 if order does not matter. This makes it a central binomial coefficient.
• the smallest weird number, a natural number that is abundant but not semiperfect.
• a palindromic number in bases 9, 13 and 34.
• a Harshad number in bases 6, 8, 9, 10, 11, 13, 14, 15 and 16.
• an Erdős–Woods number, since it is possible to find sequences of 70 consecutive integers such that each inner member shares a factor with either the first or the last member.

In science

• 70 is the atomic number of ytterbium, a lanthanide

  Astronomy

• Messier object M70, a magnitude 9.0 globular cluster in the constellation Sagittarius
• The New General Catalogue NGC 70, a magnitude 13.4 spiral galaxy in the constellation Andromeda

  In religion

• In Jewish tradition:
• * Seventy souls went down to Egypt to begin the Hebrews' Egyptian exile.
• * There is a core of 70 nations and 70 world languages, paralleling the 70 names in the Table of Nations.
• * There were 70 men in the Great Sanhedrin, the Supreme Court of ancient Israel.
• * According to the Jewish Aggada, there are 70 perspectives to the Torah.
• * Seventy elders were assembled by Moses on God's command in the desert.
• * allots three score and ten for a man's life, and the Mishnah attributes that age to "strength", as one who survives that age is described by the verse as "the strong".
• *Ptolemy II Philadelphus ordered 72 Jewish elders to translate the Torah into Greek; the result was the Septuagint. The Roman numeral seventy, LXX, is the scholarly symbol for the Septuagint.
• In Christianity:
• *In, Jesus tells Peter to forgive people seventy times seven times.
• *In, Jesus appoints Seventy Disciples and sends them out in pairs to preach the Gospel.
• Seventy is a priesthood office in the Latter Day Saint religion.
• In Islamic history and in Islamic interpretation the number 70 or 72 is most often and generally hyperbole for an infinite amount:
• * There are 70 dead among the Prophet Muhammad's adversaries during the Battle of Badr.
• * 70 of the Prophet Muhammad's followers are martyred at the Battle of Uhud.
• * In Shia Islam, there are 70 martyrs among Imam Hussein's followers during the tragedy of Karbala.

  In law

• In certain cases, copyrights expire after 70 years.

  In sports

• In Olympic archery, the targets are 70 meters from the archers.
• In college football, two teams scored 70 points in bowl games, the most in such contests: first the West Virginia Mountaineers against the Clemson Tigers in the 2012 Orange Bowl, and the Army Black Knights against the Houston Cougars in the 2018 Armed Forces Bowl.
• The number of the laps of the Canadian Grand Prix and Hungarian Grand Prix.

  In other fields

• 70 miles per hour is a common speed limit for freeways in many American states, primarily in the central United States.
• 70 miles per hour is the national speed limit in the United Kingdom for cars and motorcycles on the best grades of road.
• 70 years of marriage is marked by a platinum wedding anniversary.
• 70 is the hull number of the U.S. Navy's nuclear aircraft carrier USS Carl Vinson, named after U.S. Representative Carl Vinson.
• The French department Haute-Saône is number 70.
• As a year, "70" may refer to 70 BC, AD 70, or 1970.
• The number 70 is frequently referenced by the musical duo Boards of Canada: they have songs titled "Sixtyten" and "The Smallest Weird Number", and their record label is named Music70.
• In the Far Eastern culture of China, Japan, Korea, etc., 70 years old is called the Rare Age of the Olden Times, as written in one of Du Fu's poems.
• Under Social Security, the age at which a person can receive the maximum retirement benefits

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