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is the sum of the first thirty-six natural numbers, which makes it a triangular number: [4] ∑ i = 1 36 i = 1 + 2 + 3 + ⋯ + 34 + 35 + 36 = 666 {\displaystyle \sum _{i=1} In Christianity, 666 is referred to in (most manuscripts of) chapter 13 of the Book of Revelation of the New Testament as the " number of the beast." [1] [2] [3] In mathematics [ edit ]
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