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 A083907 #20 Aug 27 2025 11:41:27 %S A083907 1,2,6,6,30,30,210,210,210,210,2310,2310,30030,30030,30030,30030, %T A083907 510510,510510,9699690,9699690,9699690,9699690,223092870,223092870, %U A083907 223092870,223092870,223092870,223092870,6469693230,6469693230,200560490130,200560490130 %N A083907 Duplicate of A034386. %C A083907 Previous name was: a(1) = 1; for n>1, a(n) = n*a(n-1) if GCD(n,a(n-1)) = 1 else a(n) = a(n-1). %K A083907 dead %O A083907 1,2 %A A083907 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 19 2003