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Something Special About 399 (and 2015) - Numberphile

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It is the lowest Lucas-Carmichael Number... Featuring Ed Copeland. More about Ed's real work: http://bit.ly/CopelandGoesLong
With thanks to these Patreon supporters:
Herschal Sanders (from Susan)
Today I Found Out

OK Merli
Alex Bozzi
Thomas J Petersen
Spiked Math
Filipe Junqueira
Bill Shillito
plusunim
Micky Baeza
Tracy Parry
Andrzej 'Yester' Fiedukowicz
Stan Ciprian
Rich Pantano (from Jill)
Joshua Wilson & Andrew Touchet
Kelly N
Cooper Stimson

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