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 A340303 #4 Jan 03 2021 22:42:09
%S A340303 10800,12600,54000,75600,148176,162000,264600,324000,609840,453600,
%T A340303 529200,793800,444528,648000,1058400,1323000,1764000,1620000,2116800,
%U A340303 2646000,2721600,3704400,3969000,6403320,4233600,5292000,4860000,6223392,7938000,7408800,8467200
%N A340303 Numbers k such that k and the next two numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.
%C A340303 Numbers k such that A007947(k) = A007947(A081761(k)) = A007947(A081761(A081761(k))).
%H A340303 <a href="/index/Pri#prime_signature">Index entries for sequences related to prime signature</a>
%e A340303 10800 = 2^4 * 3^3 * 5^2 is a term since 10800 and the next two numbers with the same prime signature as 10800, 16200 = 2^3 * 3^4 * 5^2 and 18000 = 2^4 * 3^2 * 5^3, have the same set of distinct prime divisors, {2, 3, 5}.
%Y A340303 Subsequence of A340302.
%Y A340303 Cf. A007947, A081761, A118914.
%K A340303 nonn
%O A340303 1,1
%A A340303 _Amiram Eldar_, Jan 03 2021