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 A180461 #12 Mar 05 2014 15:11:40 %S A180461 1,0,0,0,312399,8911029,187131609,5560483959,126501010209, %T A180461 3186244194273,85514682943809,2206011586559697,55462952723504823, %U A180461 1577373555132452973,37744962467192492463,974816528291192900817,25345238283868264629273,658976194648474007782617,17245346702665551116114601 %N A180461 a(n) is the smallest number m such that sigma(m)=26^n, or 0 if m does not exist. %H A180461 Max Alekseyev, <a href="/A180461/b180461.txt">Table of n, a(n) for n = 0..100</a> %e A180461 a(4)=312399=3^2*103*337 since sigma(3^2*103*337)=(13)*(2^3*13)*(2*13^2)=2^4*13^4 and 312399 is the smallest such number. %Y A180461 Cf. A048251, A110077, A180265, A180460, A180462, A180463, A180464. %K A180461 nonn %O A180461 0,5 %A A180461 _Walter Kehowski_, Sep 06 2010 %E A180461 Terms a(17) onward from _Max Alekseyev_, Mar 04 2014