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 A160134 #3 Mar 30 2012 19:00:15 %S A160134 180,252,396,468,612,684,828,1044,1116,1260,1332,1476,1548,1692,1908, %T A160134 1980,2124,2196,2340,2412,2556,2628,2772,2844,2988,3060,3204,3276, %U A160134 3420,3492,3636,3708,3852,3924,4068,4140,4284,4572,4716 %N A160134 Nonprimitive e-perfect numbers. %C A160134 The nonprimitive e-perfect numbers are e-perfect (A054979) but not primitive e-perfect (A054980). %F A160134 A054979 \ A054980, where \ is the SET-MINUS symbol. %e A160134 a(1) = 180, 180 = 5 * 36; 5 is squarefree and relatively prime to the primitive e-perfect number 36, i.e. A054980(1). %Y A160134 Cf. A051377, A054980. %K A160134 nonn %O A160134 1,1 %A A160134 _Jaroslav Krizek_, May 02 2009 %E A160134 Edited by _R. J. Mathar_, May 16 2009