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 A327534 #5 Sep 18 2019 04:57:49
%S A327534 1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,22,23,24,26,28,29,
%T A327534 30,31,32,33,34,35,36,37,38,40,41,42,43,44,45,46,47,48,50,51,52,53,54,
%U A327534 55,56,58,59,60,61,62,64,66,67,68,69,70,71,72,73,74,75,76
%N A327534 Numbers that are 1, prime, or whose prime indices are relatively prime.
%C A327534 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. Numbers whose prime indices are relatively prime are A289509.
%H A327534 Gus Wiseman, <a href="https://docs.google.com/document/d/e/2PACX-1vSX9dPMGJhxB8rOknCGvOs6PiyhupdWNpqLsnphdgU6MEVqFBnWugAXidDhwHeKqZe_YnUqYeGOXsOk/pub">Sequences counting and encoding certain classes of multisets</a>
%F A327534 Equals the union of {1}, A000040, and A289509.
%e A327534 91 = 7 * 13 has prime indices {4,6}, which have a common divisor of 2, so 91 is not in the sequence.
%t A327534 Select[Range[100],#==1||PrimeQ[#]||GCD@@PrimePi/@First/@FactorInteger[#]==1&]
%Y A327534 See link for additional cross-references.
%Y A327534 Complement of A327407.
%Y A327534 Cf. A056239, A112798, A281116, A289509, A302569.
%K A327534 nonn
%O A327534 1,2
%A A327534 _Gus Wiseman_, Sep 17 2019