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Andy D.

asked • 05/01/19

Sequences in Sequences

How would you find the sum of the sequence:

0,4,12,24,40,60,...,760

whose terms increase based on the arithmetic sequence:

4,8,12,...

It seems similar to triangular numbers.


How would you find the sum of these sequences in general? (e.g. 5,7,12,20,31... whose terms increase based on the arithmetic sequence 2,5,8,11,...)

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