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 A275650 #14 Dec 25 2016 12:08:59 %S A275650 4,28,214,1803,15830,142844,1313047,12220699,114790260,1085885280, %T A275650 10330026070,98719755796,947012920362,9113815047794,87950106960771, %U A275650 850754904051968 %N A275650 Number of positive integers k less than 10^n such that k is a sum of two squares and k/2 is an even power. %C A275650 This sequence gives the values of the counting function V(x), whose values are given in table 3 on page 359 of Shiu, 1986. %H A275650 P. Shiu, <a href="http://dx.doi.org/10.1090/S0025-5718-1986-0842141-1">Counting sums of two squares: the Meissel-Lehmer method</a>, Mathematics of Computation, 47 (1986), 351-360. %Y A275650 Cf. A164775: W(x), A275649: U(x). %K A275650 nonn,more %O A275650 1,1 %A A275650 _Felix Fröhlich_, Aug 04 2016 %E A275650 a(12) corrected and a(13)-a(16) added by _Hiroaki Yamanouchi_, Dec 25 2016