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%I #15 May 16 2024 08:40:38
%S 1,7,19,44,61,133,127,256,297,427,331,836,469,889,1159,1408,817,2079,
%T 1027,2684,2413,2317,1519,4864,2825,3283,4131,5588,2437,8113,2791,
%U 7424,6289,5719,7747,13068,3997,7189,8911,15616,4921,16891,5419,14564,18117,10633,6487,26752
%N a(n) = Sum_{j=1..n} Sum_{k=1..n} gcd(j*k,n).
%H Seiichi Manyama, <a href="/A372881/b372881.txt">Table of n, a(n) for n = 1..1000</a>
%o (PARI) a(n) = sum(j=1, n, sum(k=1, n, gcd(j*k, n)));
%Y Cf. A018804, A078430.
%K nonn,mult
%O 1,2
%A _Seiichi Manyama_, May 15 2024
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