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 A071297 #10 Mar 31 2012 10:26:00 %S A071297 2,5,4,10,8,56,8,39,10,38,9,208,15,37,95,143,7,502,2,319,184,235,2, %T A071297 1631,68,142,58,614,71,14216,14,5286,81,149,251,4018,12,17,79,5162,21, %U A071297 43065,34,3858,932,140,6,12852,27,2457,360,1121,37,10014 %N A071297 Number of n-digit terms of A070153. %C A071297 Pairs (r,s) = (A070152(k), A070153(k)) are such that sum(j=r to s, j) equals the concatenation of r and s. %H A071297 R. Hoshino, <a href="http://cms.math.ca/crux/v27/n1/public_page34-47.pdf">Astonishing Pairs of Numbers</a>, Crux Mathematicorum 27(1), 2001, p. 39-44. %e A071297 a(3) = 4 since 119, 403, 533, 623 are the only three-digit terms of A070153. %Y A071297 Cf. A070152, A070153. %K A071297 nonn,base %O A071297 1,1 %A A071297 _Lekraj Beedassy_, Jun 11 2002 %E A071297 Edited and corrected by _Klaus Brockhaus_, Jun 06 2003 %E A071297 a(6), a(7) and a(8) from _Klaus Brockhaus_, Jun 20 2003 %E A071297 a(6) corrected and terms a(9) onward added by _Max Alekseyev_, Feb 13 2012