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 A075004 #5 Dec 05 2013 19:55:34 %S A075004 70,107,144,181,218,255,292,329,366,3703,40370,43737,47104,50471, %T A075004 53838,57205,60572,63939,67306,70673,74040,77407,80774,84141,87508, %U A075004 90875,94242,97609,100976,104343,107710,111077,114444,117811,121178,124545 %N A075004 Floor[ concatenation of n+2, n+1 and n divided by 3 ]. %e A075004 Sequence exhibits similar properties to A074991. %p A075004 70, 107, 144, 181, 218, 255, 292, 329, 366, 3703, seq(floor(((n+2)*10^4+(n+1)*10^2+n)/3),n=10..99); %Y A075004 Cf. A074991 to A075000, A075003 and A075005 to A075010. %K A075004 base,nonn %O A075004 0,1 %A A075004 _Amarnath Murthy_, Sep 01 2002 %E A075004 More terms from _Sascha Kurz_, Jan 14 2003