[seqfan] Trappist-1 sequence
W. Edwin Clark
wclark at mail.usf.edu
Thu May 18 00:46:39 CEST 2017
I would submit this finite sequence,
but I'm not sure of the proper terminology to describe the sequence.
It comes from this description of the orbits of the f7 Trappist-1 planets.
All seven TRAPPIST-1 planets are locked in what's known as “orbital
> resonance.” Each planet takes a certain amount of time to orbit their sun —
> that's the length of its year. The lengths of the planets' years are
> related to one another in whole-number ratios. So, in the amount of time it
> takes the outermost planet to complete two orbits of the sun, the next
> planet has completed three orbits, the next one four orbits, then six, then
> nine, 15 and 24.
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