I have a formula for the fibonacci sequence (with 1 being the first) and I noticed that the 12th fibonacci number was 144. I thought that was a neat coincidence, so I I headed over to mathematica to see if this (and 1) were the only numbers that had this property. I was almost certain that it was. So I plotted the two graphs, but only the x^2 graphed showed up. Here was my input. My question is about what I did wrong.(adsbygoogle = window.adsbygoogle || []).push({});

phi := (1 + Sqrt[5])/2

phih := (1 - Sqrt[5])/2

f:={(phi^n)-(phih^n)}/{Sqrt[5]}

y:=n^2

Plot[{f, y}, {n, -20, 20}]

Now, this works when I remove the phih term, which works well enough that I can clearly see that only 1 and 12 are solutions. On the other hand, this is not plotting something that it should be plotting...

Anyway, thank you in advance for the help.

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# [Mathematica] Simple Problem with the plot function

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