Donate SIGN UP

Math problem

Avatar Image
Kevin9 | 16:03 Fri 28th Mar 2003 | How it Works
4 Answers
Here's a number pattern: -2 1 6 13 22 33. The pattern is that for example the amount of numbers between -2 and 1 are 3. 1 and 6 is 5. 6 and 13 is 7. So it goes 3 5 7 9 11 13 etc. I need to make a formula that will work out which number is next in the first sequence but I can't think of one that will work.
Gravatar

Answers

1 to 4 of 4rss feed

Best Answer

No best answer has yet been selected by Kevin9. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.
well if you only need a formula to calculate the next number it's easy enough. if x = next number, l = the last number you already have and p = penultimate number you already have then x = 2l - p + 2. If, however, you're actually after a general formula to calculate the nth number in the sequence then it's harder and i'm still working on it.
ok i've got it (with the help of Excel). The nth number in the sequence is n squared minus 3. simple as that.
How do you get the amount of numbers between 2 and 1 as 3?
ukkud - thats -2 (minus 2) and 1. difference there is 3.

1 to 4 of 4rss feed

Do you know the answer?

Math problem

Answer Question >>