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 A280377 #6 Sep 08 2022 08:46:18
%S A280377 1,2,4,7,31,41,761,1076,5556,10092,3638892,3650442,482652042,
%T A280377 496551642,539602650,1178115525,20923968003525,20925873907525,
%U A280377 6423299579635525,6423418373678893,6491526825518893,11027299390478893,1124011755076998158893,1124011800169644507643
%N A280377 Partial sums of A119619.
%C A280377 A119619(n) = Product_{d|n} pxi(d), where pxi(m) is the product of totatives of m (A001783).
%F A280377 a(n) = Sum_{i=1..n} A119619(i).
%o A280377 (Magma) [&+[&*[&*[h: h in [1..d] | GCD(h,d) eq 1]: d in Divisors(k)]: k in [1..n]]: n in [1..100]]
%Y A280377 Cf. A119619, A280378.
%K A280377 nonn
%O A280377 1,2
%A A280377 _Jaroslav Krizek_, Jan 07 2017