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A349086 The number of six-term Egyptian fractions of rational numbers, x/y, 0 < x/y < 1, ordered as below. The sequence is the number of (p,q,r,s,t,u) such that x/y = 1/p + 1/q + 1/r + 1/s + 1/t + 1/u where p, q, r, s, t, and u are integers with p < q < r < s < t < u. 1

%I #28 Dec 05 2021 05:39:39

%S 244817,3421052,206917,18420699,244817,49938,64025680,6462507,1434759,

%T 41993,131223239,3421052,244817,206917,16018,431008820,38282319,

%U 3506679,3879468,323772,108276,681922142,18420699,21874941,244817,659687,49938,45169

%N The number of six-term Egyptian fractions of rational numbers, x/y, 0 < x/y < 1, ordered as below. The sequence is the number of (p,q,r,s,t,u) such that x/y = 1/p + 1/q + 1/r + 1/s + 1/t + 1/u where p, q, r, s, t, and u are integers with p < q < r < s < t < u.

%C The sequence are the terms in a triangle, where the rows correspond to the denominator of the rational number (starting with 2) and the columns correspond to the numerators:

%C x = 1 2 3 4 5 Rationals x/y:

%C Row 1: (y=2) 244817 1/2

%C Row 2: (y=3) 3421052 206917 1/3, 2/3

%C Row 3: (y=4) 18420699 244817 49938 1/4, 2/4, 3/4

%C Row 4: (y=5) 64025680 6462507 1434759 41993 1/5, 2/5, 3/5, 4/5

%C Row 5: (y=6) 131223239 3421052 244817 206917 16018 1/6, 2/6, 3/6, 4/6, 5/6

%C Alternatively, order the rational numbers, x/y, 0 < x/y < 1, in this order: 1/2, 1/3, 2/3, 1/4, 2/4, 3/4, 1/5, 2/5, ... The numerators of the n-th rational number are A002260(n) and the denominators are A003057(n).

%H Jud McCranie, <a href="/A349086/b349086.txt">Table of n, a(n) for n = 1..36</a>

%Y Cf. A241883, A002260, A003057, A349082, A349083, A349084, A349085.

%K nonn,tabl

%O 1,1

%A _Jud McCranie_, Nov 19 2021

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Last modified July 28 16:07 EDT 2024. Contains 374698 sequences. (Running on oeis4.)