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Triangular number AND sum of first m factorials
01-09-2018, 10:16 PM
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RE: Triangular number AND sum of first m factorials
(01-09-2018 04:31 PM)Joe Horn Wrote:  153 (my favorite number) is both a triangular number (the sum of the integers 1 through \(n\); in this case \(n=17\)) as well as the sum of the factorials \(1!\) through \(m!\) (in this case \(m=5\))

It's also a narcissistic number:

153 = 1^3 + 5^3 + 3^3

V.
.

  
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RE: Triangular number AND sum of first m factorials - Valentin Albillo - 01-09-2018 10:16 PM



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