erdős #1026
Let be a sequence of distinct real numbers. Determinewhere the maximum is taken over all monotonic subsequences.
Worked, still open.
combinatorics · solved · 0 attempts
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A391431 — Numerator of k + a/k where n = k^2 + 2*a + 1 and -k <= a <= k.1,1,3,2,2,7,5,8,3,3,13,10,7,11,15,4,4,21,17,22,9,23,19,24,5,5,31,26,16,27,11,28,17,29,35,6,6,43,37,44,19,45,13,46,20,47,A391490 — Denominator of k + a/k where n = k^2 + 2a + 1 and -k <= a <= k.1,1,2,1,1,3,2,3,1,1,4,3,2,3,4,1,1,5,4,5,2,5,4,5,1,1,6,5,3,5,2,5,3,5,6,1,1,7,6,7,3,7,2,7,3,7,6,7,1,1,8,7,4,7,8,7,2,7,8,7,
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