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Quote: Originally Posted by mathh18 can anyone help write a closed formula for any of these? 1, 7, 13, 19, 25... 2, 10, 50, 250, 1250... -3, 5, 17, 33, 53... i'm stuck on all three of these, any help would be great thank you so so so much! 1) common difference is 6 - try k and find k that works. 2) Dividing shows the same number - 5, try 3) the difference is 8, 12, 16, 20 and then again is 4 which suggests a formula of the form - find p,q and r.