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 A340304 #4 Jan 03 2021 22:42:15
%S A340304 529200,1058400,2646000,3704400,5292000,9720000,15876000,22226400,
%T A340304 18522000,31752000
%N A340304 Numbers k such that k and the next three numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.
%C A340304 Numbers k such that A007947(k) = A007947(A081761(k)) = A007947(A081761(A081761(k))) = A007947(A081761(A081761(A081761(k)))).
%C A340304 The analogous sequence with the next four numbers after k begins with 2646000, 15876000, ...
%H A340304 <a href="/index/Pri#prime_signature">Index entries for sequences related to prime signature</a>
%e A340304 529200 = 2^4 * 3^3 * 5^2 * 7^2 is a term since 529200 and the next three numbers with the same prime signature as 529200, 793800 = 2^3 * 3^4 * 5^2 * 7^2, 882000 = 2^4 * 3^2 * 5^3 * 7^2, and 1234800 = 2^4 * 3^2 * 5^2 * 7^3, have the same set of distinct prime divisors, {2, 3, 5, 7}.
%Y A340304 Subsequence of A340302 and A340303.
%Y A340304 Cf. A007947, A081761, A118914.
%K A340304 nonn,more
%O A340304 1,1
%A A340304 _Amiram Eldar_, Jan 03 2021