eoht31415 Posts: 1, Reputation: 1 New Member #1 Dec 15, 2017, 06:44 AM
1,5,23,85,271 nth sequence
What is the nth sequence?
 joypulv Posts: 21,593, Reputation: 2941 current pert #2 Dec 15, 2017, 07:00 AM
Hi! We help with homework; we don't do it for you. With pi in your ID, I'm sure you can start. Let us know.

(PS- I spent about 3 minutes on it and didn't get it.)
 ma0641 Posts: 15,681, Reputation: 1012 Uber Member #3 Dec 19, 2017, 09:31 PM
Not a Fibonacci sequence. I tried a few other Nth sequences but no answer.
 ebaines Posts: 12,131, Reputation: 1307 Expert #4 Jan 5, 2018, 02:49 PM
Could it be that the last number given should be 221 rather than 271? Just a guess...
 CWH68 Posts: 26, Reputation: 2 New Member #5 Feb 13, 2018, 02:48 PM
There is a unique 4th degree polynomial P such that P(1) = 1, P(2) = 5, and P(n) would be the nth term of the sequence. Maybe that's it.

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