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 A184872 #4 Mar 30 2012 18:57:17 %S A184872 2,5,8,11,15,17,21,24,27,30,33,36,40,42,45,49,51,55,57,61,64,67,70,74, %T A184872 76,80,83,86,89,91,95,98,101,104,108,110,114,116,120,123,126,129,132, %U A184872 135,138,142,144,148,150,154,157,160,163,167,169,173,175,178,182,184,188,191,194,197,201,203,207,209,213,216,219,222,225,228,231,234,237,241,243,247,250,253,256,259,262,265,268,271,275,277,281,284,287,290,293,296,300,302,306,309,311,315,317,321,324,327,330,334,336,340,343,346,349,352,355,358,361,364,368,370 %N A184872 n+floor(nr/s)+floor(nt/s), where r=log(2), s=log(3), t=log(5). %C A184872 See A184871. %t A184872 r=Log[2]; s=Log[3]; t=Log[5]; %t A184872 a[n_]:=n+Floor [n*s/r]+Floor[n*t/r]; %t A184872 b[n_]:=n+Floor [n*r/s]+Floor[n*t/s]; %t A184872 c[n_]:=n+Floor[n*r/t]+Floor[n*s/t]; %t A184872 Table[a[n],{n,1,120}] (* A184871 *) %t A184872 Table[b[n],{n,1,120}] (* A184872 *) %t A184872 Table[c[n],{n,1,120}] (* A184873 *) %Y A184872 Cf. A184871, A184873, A184875 (primes in A184872). %K A184872 nonn %O A184872 1,1 %A A184872 _Clark Kimberling_, Jan 23 2011