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 A373868 #16 Jul 03 2024 08:36:55 %S A373868 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26, %T A373868 27,28,29,30,31,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50, %U A373868 51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70 %N A373868 Integers that are not perfect fifth powers. %C A373868 Complement of A000584. %H A373868 A. J. dos Reis and D. M. Silberger, <a href="https://doi.org/10.2307/2691513">Generating nonpowers by formula</a>, Math. Mag., 63 (1990), 53-55. %t A373868 Complement[Range[#^5], Range[#]^5] & [3] (* _Paolo Xausa_, Jul 03 2024 *) %o A373868 (Python) %o A373868 from sympy import integer_nthroot %o A373868 def A373868(n): return n+(k:=integer_nthroot(n, 5)[0])+(n>=(k+1)**5-k) %Y A373868 Cf. A000037, A000583, A000584, A007412, A140823. %K A373868 nonn,easy %O A373868 1,1 %A A373868 _Chai Wah Wu_, Jun 19 2024