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 A137450 #16 Mar 13 2018 04:45:15 %S A137450 1,1,2,2,10,2,52,53,187,26,2291,129,25588,2758,4271,22523,678325, %T A137450 28362,11607386,1163963,2111498,601221,222671145,12394049,856676621, %U A137450 59403427,1983047734,307321811,77544004469,57508385 %N A137450 A038610(n) (the LCM of the positive integers that are <= n and are coprime to n) is the a(n)-th positive integer that is coprime to n. %e A137450 The positive integers that are <= 10 and are coprime to 10 are 1,3,7,9; lcm(1,3,7,9) = 63. Now the positive integers that are coprime to 10 form a sequence that begins: 1, 3, 7, 9, 11, 13, 17, 19, 21, 23, 27, 29, 31, 33, 37, 39, 41, 43, 47, 49, 51, 53, 57, 59, 61, 63, 67, 69, ... %e A137450 Since 63 is the 26th of these integers, a(10) = 26. %Y A137450 Cf. A038610. %K A137450 nonn %O A137450 1,3 %A A137450 _Leroy Quet_, Apr 18 2008 %E A137450 More terms from _Sean A. Irvine_, Nov 15 2009