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 A175052 #7 Mar 11 2014 01:32:49 %S A175052 4,25,32,121,128,196,225,343,484,1000,1331,1728,2048,2187,2197,2704, %T A175052 3025,3375,4913,5776,6859,7744,8000,8100,9261,10648,12167,13824,16641, %U A175052 17424,19683,21904,24389,26896,29791,32768,35721,39204,42849,50625 %N A175052 Perfect powers (members of A001597) n where the next larger perfect power is congruent mod 2 to n. %e A175052 25 (25 = 5^2) are 27 (27 = 3^3) are consecutive perfect powers. Since both are odd, then 25 is in this sequence. %e A175052 128 (128 = 2^7) and 144 (144 = 12^2) are consecutive perfect powers. Since both are even, then 128 is in this sequence. %Y A175052 Cf. A001597, A175053 %K A175052 nonn %O A175052 1,1 %A A175052 _Leroy Quet_, Dec 08 2009 %E A175052 Extended by _Ray Chandler_, Dec 10 2009