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 A278029 #20 Feb 28 2024 05:20:17 %S A278029 0,1,2,0,3,4,5,0,0,6,7,8,9,10,11,0,12,13,14,15,16,17,18,19,0,20,0,21, %T A278029 22,23,24,0,25,26,27,0,28,29,30,31,32,33,34,35,36,37,38,39,0,40,41,42, %U A278029 43,44,45,46,47,48,49,50,51,52,53,0,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,0 %N A278029 a(1) = 0; for n > 1, a(n) = k if n is a non-perfect-power, A007916(k); or 0 if n is a perfect power. %H A278029 Rémy Sigrist, <a href="/A278029/b278029.txt">Table of n, a(n) for n = 1..10000</a> %H A278029 N. J. A. Sloane, <a href="/A278028/a278028.txt">Maple programs for A007916, A278028, A278029, A052409, A089723, A277564</a> %t A278029 FoldList[Boole[#2 != #1] #2 &, #] &@ Accumulate@ Array[Boole[And[# > 1, CoprimeQ @@ FactorInteger[#][[All, -1]]]] &, 81] (* _Michael De Vlieger_, Dec 18 2016 *) %Y A278029 Cf. A007916, A072813, A289023. %K A278029 nonn,easy %O A278029 1,3 %A A278029 _N. J. A. Sloane_, Nov 10 2016 %E A278029 Name corrected by _Peter Munn_, Feb 28 2024