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Oct 1, 2017 at 23:05 comment added David S. Newman @MaxAlekseyev Thanks for the code. Unfortunately I've been unable to follow it thusfar, perhaps because I'm unfamiliar with Pari. I've been using Mathematica only for the last several years.
Sep 27, 2017 at 14:56 comment added Max Alekseyev @DavidS.Newman: I've added my code. It took about an hour and a half to complete the brute-force here.
Sep 27, 2017 at 14:55 history edited Max Alekseyev CC BY-SA 3.0
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Sep 27, 2017 at 14:44 vote accept David S. Newman
Sep 27, 2017 at 14:42 comment added David S. Newman @MaxAlekseyev Thank you for this. How long did your search for the maximal series take? Could you provide me with the program? Your solution with degree 121 is better than I ever found. The next logical thing to try by way of a search is to write 1/(1-x^2) as 1+x^2+x^4+...before changing the signs.
Sep 27, 2017 at 14:30 history edited Max Alekseyev CC BY-SA 3.0
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Sep 27, 2017 at 12:42 comment added Max Alekseyev @FedorPetrov: en.wikipedia.org/wiki/Backtracking
Sep 27, 2017 at 12:38 comment added Fedor Petrov But on the first glance there are too many variants to check.
Sep 27, 2017 at 12:36 comment added Max Alekseyev @FedorPetrov: I've brute-forced this. One of the maximum solutions is given above.
Sep 27, 2017 at 12:33 comment added Fedor Petrov Why it is not possible?
Sep 27, 2017 at 12:06 history answered Max Alekseyev CC BY-SA 3.0