Summation on HP 42S
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09-25-2018, 08:59 PM
(This post was last modified: 09-25-2018 11:15 PM by Albert Chan.)
Post: #26
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RE: Summation on HP 42S
(09-25-2018 08:01 PM)Valentin Albillo Wrote:(09-25-2018 07:17 PM)Albert Chan Wrote: What is formula for sum of 1 + 1/3 + 1/6 + 1/10 + ... + 1/(1 + 2 + 3 + ... + n) ? It was actually the Huygen's test (I got that from Mathematical Universe, page 144). Leibniz, father of calculus, need to pass this to be accepted as Huygen's student. It were not meant to be hard ... Edit: here is a harder one, but do not attempt until above can be solve Find formula for sum of 1/2 + 1/5 + 1/9 + 1/14 + ... + 1/((1 + 2 + 3 + ... + n) + n) |
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