@11011110 Oo! Are they related to the poet Linton Quasi-Johnson? ;-) (I shall have a look at Qvist when I have the time.)
@Catbread It always takes me a moment to figure out it's not some variant of Lambert's W function.
@christianp Thanks for keeping the place safe and pleasant, Christian!
@christianp What are the best coordinates? Paul Erdős used polar.
@ColinTheMathmo "Special case" is the helpful answer. "Non-anagram" is the not-helpful one.
@ColinTheMathmo You have a pet kangaroo?!
@christianp It's 83*13. (After checking 2, 3, 5, my next step is subtracting 1001 to look for 7, 11, 13).
@hafnia Er, not sure where the pp came from. I’ll pretend I got an underling to do my tooting for me.
@christianp I think would be drawn by some mysterious force towards geomags.
@mjd I reckon you could leverage special triangles to reduce your workload -- 15, 30 and 45º are all very straightforward, and would need only 1º to 7º to refine them. I think 18 and 36º are simple, too, so you could get multiples of 3º exactly. Everything is within 1º of those :o)
@petrilaarne I was about to suggest reduction formulas and various other close cousins :-)
@petrilaarne Proof by induction.
@ColinTheMathmo There's a similar thing here: https://math.stackexchange.com/questions/1090319/is-f-n2-28-always-a-composite-number/1090532#1090532
@ColinTheMathmo (Noodling about, 41 appears to be a better number than 43; apart from F₀, any counterexample has at least 74 digits; I can write properer code later on.)
@christianp You can do a similar sort of comb with the middle row:
A mathematician with nothing to prove.
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