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Series of Oblong Numbers

The following geometric arrays suggest a sequence of numbers:

2 6 12 20

a)Find the next three terms.
b)Find the 100 term.
c)Find the nth term.

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Solution:

The given numbers is a series of oblong numbers.

The nth oblong number is defined as

On = n(n+1)

To get the numbers we define as follows:

Since

On = n(n+1)

When

n = ...

Solution Summary

A Series of Oblong Numbers is investigated.

$2.19