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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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+ There are 7 different notes in a standard major scale in music as well as in a standard minor scale. [Obeidin]

+ The very first Menorah for the Tabernacle as commanded by God to be built in the book of Exodus had 7 lamps in it. [Obeidin]

+ In "Western" music's 12-tone scale, ratios of fractions between 2 and 1 with a one-digit denominator that involve 7 are not used. This is true whether 7 is either in the numerator or denominator. Ratios such as 7/4, 7/5, 7/6, 8/7, 9/7, etc. are often common notes in the music of other cultures or blues music, but not the "Western" equal temperament scale. [Obeidin]

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