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 A180463 #11 Mar 05 2014 15:01:34 %S A180463 1,37,0,0,0,0,0,85811686941,3175032416817,159809964979789, %T A180463 4561513295803851,155532888827892597,5754716886632026089, %U A180463 249887680992407652771,8319571903089894983277,307824160414326114381249,12077787753685017948512649,455818072892233197941369463 %N A180463 a(n) is the smallest number m such that sigma(m)=38^n, or 0 if m does not exist. %H A180463 Max Alekseyev, <a href="/A180463/b180463.txt">Table of n, a(n) for n = 0..100</a> %e A180463 a(7)=85811686941=3*28603895647 since sigma(85811686941)= (2^2)*(2^5*19^7)=2^7*19^7 and 85811686941 is the smallest such number. %Y A180463 Cf. A048251, A110077, A180265, A180460, A180461, A180462, A180464. %K A180463 nonn %O A180463 0,2 %A A180463 _Walter Kehowski_, Sep 06 2010 %E A180463 Terms a(16) onward from _Max Alekseyev_, Mar 03 2014