This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A126575 #10 Oct 10 2019 13:47:09
%S A126575 1,5,47,103,461,21211,24183,62081,735503,38230051,4501873,40137823,
%T A126575 1571907737,776878687,13914337609,13784887072529,93498082849,
%U A126575 1626565056793,25260167753,213051987097,15224249929987129
%N A126575 a(n) = numerator of the sum of reciprocals of the terms in n-th row of triangle A126571.
%e A126575 Row 4 of triangle A126571 is (4,7,5,7).
%e A126575 So a(4) is the numerator of 1/4 +1/7 +1/5 + 1/7 = 103/84.
%t A126575 f[m_, n_] := Block[{k = 0, c = n},While[c > 0,k++;While[GCD[k, m] > 1, k++ ];c--;];k];Table[Numerator@Sum[1/f[m, n], {m, n}], {n, 22}] (* _Ray Chandler_, Dec 29 2006 *)
%Y A126575 Cf. A126571, A126576.
%K A126575 frac,nonn
%O A126575 1,2
%A A126575 _Leroy Quet_, Dec 28 2006
%E A126575 Extended by _Ray Chandler_, Dec 29 2006