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 A130673 #8 Oct 13 2017 03:19:36
%S A130673 2,3,6,9,13,17,21,25,29,34,39,43,48,53,58,63,68
%N A130673 Smallest m of r=1,2,3,... where the generalized Euler constants (of D. H. Lehmer) E(r,m) change their sign: E(r,m) > 0 and E(r+1,m) < 0.
%C A130673 Maple produces the following table:
%C A130673 ...m................|..r
%C A130673 ...2,...............|..1
%C A130673 ...3,.4,.5..........|..2
%C A130673 ...6,.7,.8..........|..3
%C A130673 ...9,10,11,12.......|..4
%C A130673 ..13,14,15,16.......|..5
%C A130673 ..17,18,19,20.......|..6
%C A130673 ..21,22,23,24.......|..7
%C A130673 ..25,26,27,28.......|..8
%C A130673 ..29,30,31,32,33....|..9
%C A130673 ..34,35,36,37,38....|.10
%C A130673 ..39,40,41,42.......|.11
%C A130673 ..43,44,45,46,47....|.12
%C A130673 ..48,49,50,51,52....|.13
%C A130673 ..53,54,55,56,57....|.14
%C A130673 ..58,59,60,61,62....|.15
%C A130673 ..63,64,65,66,67....|.16
%C A130673 ..68,69,70,71,72,73.|.17
%D A130673 Stefan Kraemer, Eulers constant and related numbers, preprint, 2005.
%H A130673 Stefan Kraemer, <a href="http://www.math.uni-goettingen.de/skraemer/gamma.html">Euler's Constant 0.577... Its Mathematics and History</a>
%H A130673 D. H. Lehmer, <a href="http://matwbn.icm.edu.pl/ksiazki/aa/aa27/aa27121.pdf">Euler constants for arithmetic progressions</a>, Acta Arith. 27 (1975) 125-142.
%F A130673 E(r,m) = lim_{n->oo} (H_{r,m}(n) - log n / m); E(r,m) = -1/m * (log m + Psi(r/m))
%K A130673 nonn,uned
%O A130673 1,1
%A A130673 _Stefan Krämer_, Jun 28 2007