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 A235142 #21 Feb 25 2025 05:46:13 %S A235142 4,10,22,32,64,84,108,132,186,214,284,360,446,490,590,642,694,746,930, %T A235142 990,1192,1266,1342,1568,1738,2086,2180,2276,2470,2572,2668,2780,3326, %U A235142 3556,3680,3922,4298,4430,4560,4832,4968 %N A235142 Numbers k such that A235141(k) = -1. %C A235142 The positions reflect square radii which are uniquely twice a square integer, that is, the completion of only one square on the y = x line. %F A235142 a(n) = A235386(n+1) - 1. %e A235142 For n = 2, a(2) = 10. The 10th term of A235141 is -1 corresponding to the square radius of an origin centered circle increasing from the open interval(5,8) to exactly 8. %Y A235142 A000548(n) = (A001481(1 + a(n)/2 ) )/2. %Y A235142 Cf. A235141, A234300. %K A235142 nonn %O A235142 1,1 %A A235142 _Rajan Murthy_, Jan 03 2014