Michel S.

asked • 07/31/17

what is the series formula

2,5,9,13,17,21,25,29,33,39...

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Kenneth S. answered • 07/31/17

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this isn't a series, it's a SEQUENCE.  
 
a1=2; a2 = 5; thereafater an+1 = 4 + an
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Philip P.

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39-33=6
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07/31/17

Kenneth S.

Philip, you're right.  Now we have a most awkward situation. apparently the pattern starts over at the ninth term, i.e. then increment drops to 3 to compute tenth term, and then reverts to 4 for a while.  What a revolting development!
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07/31/17

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