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A050205 Triangle read by rows: number of terms in unit fraction representation of k/n using the greedy algorithm, 1<=k<=n-1. 5

%I #33 Sep 18 2022 14:31:29

%S 1,1,2,1,1,2,1,2,2,3,1,1,1,2,2,1,2,3,2,3,3,1,1,2,1,2,2,3,1,2,1,2,2,2,

%T 3,3,1,1,2,2,1,2,2,3,3,1,2,2,2,3,2,3,4,4,4,1,1,1,1,2,1,2,2,2,2,3,1,2,

%U 3,3,3,3,2,3,3,3,3,4,1,1,2,2,2,3,1,2,2,3,3,3,4,1,2,1,2,1,2,3,2,2,2,3

%N Triangle read by rows: number of terms in unit fraction representation of k/n using the greedy algorithm, 1<=k<=n-1.

%H Seiichi Manyama, <a href="/A050205/b050205.txt">Rows n = 2..141, flattened</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/UnitFraction.html">Unit Fraction</a>.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Greedy_algorithm_for_Egyptian_fractions">Greedy algorithm for Egyptian fractions</a>.

%e 2/3 = 1/2 + 1/6. So T(3,2) = 2.

%e n\k | 1 2 3 4 5 6 7 8

%e ----*------------------------

%e 2 | 1;

%e 3 | 1, 2;

%e 4 | 1, 1, 2;

%e 5 | 1, 2, 2, 3;

%e 6 | 1, 1, 1, 2, 2;

%e 7 | 1, 2, 3, 2, 3, 3;

%e 8 | 1, 1, 2, 1, 2, 2, 3;

%e 9 | 1, 2, 1, 2, 2, 2, 3, 3;

%Y Cf. A050206, A050210 (Largest denominator), A260618.

%K nonn,easy,tabl

%O 2,3

%A _Eric W. Weisstein_

%E Offset changed to 2 by _Seiichi Manyama_, Sep 18 2022

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Last modified June 28 12:12 EDT 2024. Contains 373786 sequences. (Running on oeis4.)