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 A115014 #5 Jan 20 2024 16:22:49
%S A115014 1,1,1,1,6,6,13,13,13,13,24,24,37,37,37,37,54,54,73,73,73,73,96,96,
%T A115014 121,121,121,121,150,150,181,181,181,181,216,216,253,253,253,253,294,
%U A115014 294,337,337,337,337,384,384,433,433,433,433,486,486,541,541,541,541,600,600,661
%N A115014 a(n) = Sum_{i=1..n, gcd(6,i)=1} i.
%t A115014 Table[Sum[k*KroneckerDelta[GCD[6, k], 1], {k, n}], {n, 80}] (* _Wesley Ivan Hurt_, Jan 20 2024 *)
%Y A115014 Cf. A115012.
%K A115014 nonn,easy
%O A115014 1,5
%A A115014 _N. J. A. Sloane_, Feb 24 2006