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 A326619 #7 Jul 15 2019 01:44:26
%S A326619 1,2,1,3,3,4,1,2,2,5,3,6,5,5,1,7,3,8,2,3,3,9,3,3,7,2,5,10,2,11,1,7,4,
%T A326619 7,3,12,9,4,2,13,7,14,3,5,5,15,3,4,2,9,7,16,3,4,5,5,11,17,2,18,6,3,1,
%U A326619 9,8,19,4,11,8,20,3,21,13,5,9,9,3,22,2,2,7
%N A326619 Numerator of the average of the set of distinct prime indices of n.
%C A326619 A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798.
%e A326619 The distinct prime indices of 12 are {1,2}, with average 3/2, so a(12) = 3.
%e A326619 The sequence of fractions begins: 1, 2, 1, 3, 3/2, 4, 1, 2, 2, 5, 3/2, 6, 5/2, 5/2, 1, 7, 3/2, 8, 2, 3, 3, 9, 3/2, 3, 7/2, 2, 5/2, 10, 2.
%t A326619 Table[Numerator[Mean[PrimePi/@First/@FactorInteger[n]]],{n,2,100}]
%Y A326619 The average of the multiset of prime indices is A326567/A326568.
%Y A326619 The average of the multiset of prime factors is A123528/A123529.
%Y A326619 The average of the set of distinct prime indices is A326619/A326620.
%Y A326619 The average of the set of distinct prime factors is A323171/A323172.
%Y A326619 Cf. A001221, A067629, A078174, A078175, A112798, A316413, A326621.
%K A326619 nonn,frac
%O A326619 2,2
%A A326619 _Gus Wiseman_, Jul 14 2019