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・ 1679 in France
・ 1679 in Ireland
・ 1679 in literature
・ 1679 in music
・ 166th Air Refueling Squadron
・ 166th Airlift Wing
・ 166th Aviation Brigade (United States)
・ 166th Battalion (Queen's Own Rifles of Canada), CEF
・ 166th meridian
・ 166th meridian east
・ 166th meridian west
・ 166th New York State Legislature
・ 166th Ohio Infantry
・ 166th Street (IRT Third Avenue Line)
・ 167
167 (number)
・ 167 Avenue, Edmonton
・ 167 BC
・ 167 Catering Support Regiment RLC
・ 167 series
・ 167 Urda
・ 1670
・ 1670 AM
・ 1670 Broadway
・ 1670 in art
・ 1670 in Denmark
・ 1670 in England
・ 1670 in France
・ 1670 in Ireland
・ 1670 in literature


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

167 (one hundred () sixty-seven) is the natural number following 166 and preceding 168.
==In mathematics==
167 is a Chen prime, a Gaussian prime, a safe prime, and an Eisenstein prime with no imaginary part and a real part of the form 3n - 1.
167 is the only prime which can't be expressed as a sum of seven or less cubes.
167 is a full reptend prime in base 10, since the decimal expansion of 1/167 repeats the following 166 digits: 0.00598802395209580838323353293413173652694610778443113772455089820359281437125748502994 0119760479041916167664670658682634730538922155688622754491017964071856287425149700...
167 is a highly cototient number, as it is the smallest number ''k'' with exactly 15 solutions to the equation ''x'' - φ(''x'') = ''k''. It is also a strictly non-palindromic number.
167 is the smallest multi-digit prime such that the product of digits is equal to the number of digits times the sum of the digits, i. e., 1×6×7 = 3×(1+6+7)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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