Monday, 9 June 2014

logic - Find the sum of all the natural numbers not divisible by three between one and 3¹⁰⁰⁰⁰⁰

What is the easiest way to find the sum of all the numbers



1,2,3,...,3¹⁰⁰⁰⁰⁰ that are not divisible by 3,



possibly by using a handheld calculator and avoiding computer processing?

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