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・ 1789 in Wales
・ 178P/Hug–Bell
・ 178th (2/1st Nottinghamshire and Derbyshire) Brigade
・ 178th Battalion (Canadien-Français), CEF
・ 178th meridian
・ 178th meridian east
・ 178th meridian west
・ 178th New York State Legislature
・ 178th New York Volunteer Infantry Regiment
・ 178th Ohio Infantry
・ 178th Reconnaissance Squadron
・ 178th Tunnelling Company
・ 178th Wing
・ 178th–179th Street Tunnels
・ 179
179 (number)
・ 179 BC
・ 179 Klytaemnestra
・ 1790
・ 1790 English cricket season
・ 1790 Footprints
・ 1790 House
・ 1790 in architecture
・ 1790 in art
・ 1790 in Australia
・ 1790 in Canada
・ 1790 in Denmark
・ 1790 in France
・ 1790 in Great Britain
・ 1790 in India


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179 (number) : ウィキペディア英語版
179 (number)

179 (one hundred () seventy-nine) is the natural number following 178 and preceding 180.
==In mathematics==
179 is an odd number.
179 is a prime number; that is, it is not divisible by integer (except for 1 and itself). It is an Eisenstein prime, as it is indivisible even by complex Gaussian integers. It is a Chen prime, being two less than another prime, 181. It is a full reptend prime, meaning 1/179 has a decimal expansion of a repeated sequence of 178 digits.
179 is a safe prime, as it is one more than two times the prime 89. It is also a Sophie Germain prime, as the prime 359 is one more than two times 179. It is only the fifth number with both of these properties (after 5, 11, 23, and 83).
179 is a strictly non-palindromic number. It is not a palindromic number in any base.
179 (of 365) days of the year are even numbered.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「179 (number)」の詳細全文を読む



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