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 A280259 #17 Sep 08 2022 08:46:18
%S A280259 1,3,6,11,36,45,766,876,3119,3334,3632135,3632532,482634133,482654160,
%T A280259 483551083,485578218,20923275466219,20923275553553,6423296981281554,
%U A280259 6423296990011493,6423344287548216,6423345541114343,1124007151123148794344,1124007151123185976991
%N A280259 Partial sums of A280258.
%F A280259 a(n) = Sum_{i=1..n} A280258(i) where A280258(n) = Sum_{d|n} pxi(d), where pxi(m) is the product of totatives of m (A001783).
%t A280259 Accumulate@ Table[Sum[Times @@ Select[Range@ d, CoprimeQ[#, d] &], {d, Divisors@ n}], {n, 24}] (* _Michael De Vlieger_, Jan 01 2017 *)
%o A280259 (Magma) [&+[&+[&*[h: h in [1..d] | GCD(h,d) eq 1]: d in Divisors(k)]: k in [1..n]]: n in [1..100]]
%Y A280259 Cf. A001783, A280258, A280260.
%K A280259 nonn
%O A280259 1,2
%A A280259 _Jaroslav Krizek_, Jan 01 2017