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 A340664 #5 Jan 18 2021 18:36:59 %S A340664 2,7,14,22,41,70,110,140,181,272,385,419,573,702,868,1122,1364,1551, %T A340664 1837,2081,2435,2892,3330,3718,4265,4862,5379,6022,6604,7320,8241, %U A340664 9010,9898,10913,12029,12969,14149,15363,16610,17928,19199,20704,22331,23912,25794,27406 %N A340664 a(n)^2 is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245). %F A340664 a(n) = sqrt(A340662(n)) = A340663(n) + n - 1. %e A340664 See A340661. %Y A340664 Cf. A000290, A001597, A111245, A340661, A340662, A340663, A340695. %K A340664 nonn %O A340664 1,1 %A A340664 _Hugo Pfoertner_, Jan 18 2021