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 A190700 #9 Jul 04 2017 18:49:00 %S A190700 3,7,14,18,22,25,29,33,37,40,44,48,55,59,63,66,70,74,78,81,85,89,93, %T A190700 96,100,104,111,115,119,122,126,130,134,137,141,145,149,152,156,160, %U A190700 167,171,175,178,182,186,190,193,197,201,205,208,212,216,223,227,231,234,238,242,246,249,253,257,264,268,272,275,279,283,287,290 %N A190700 Positions of 1 in A190698. %C A190700 See A190698. %H A190700 G. C. Greubel, <a href="/A190700/b190700.txt">Table of n, a(n) for n = 1..1000</a> %t A190700 r = Sqrt[3]; b = 4; c = 1; %t A190700 f[n_] := Floor[(b*n + c)*r] - b*Floor[n*r] - Floor[c*r]; %t A190700 t = Table[f[n], {n, 1, 200}] (* A190698 *) %t A190700 Flatten[Position[t, 0]] (* A190699 *) %t A190700 Flatten[Position[t, 1]] (* A190700 *) %t A190700 Flatten[Position[t, 2]] (* A190701 *) %t A190700 Flatten[Position[t, 3]] (* A190702 *) %t A190700 Flatten[Position[t, 4]] (* A190703 *) %t A190700 With[{r=Sqrt[3]},Flatten[Position[Table[Floor[r(4n+1)]-4*Floor[r*n]- Floor[r],{n,300}],1]]] (* _Harvey P. Dale_, May 25 2013 *) %Y A190700 Cf. A190698. %K A190700 nonn %O A190700 1,1 %A A190700 _Clark Kimberling_, May 17 2011