Triangular number AND sum of first m factorials

01092018, 10:16 PM
Post: #3




RE: Triangular number AND sum of first m factorials
(01092018 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. . All My Articles & other Materials here: Valentin Albillo's HP Collection 

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