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 A377928 #7 Nov 24 2024 00:05:44 %S A377928 1,2039,2703,30083,32155,32437,86925,292101,339137,430611,669371, %T A377928 670563,727051,1161819,1534325,1541819,1543011,2027935,2718001, %U A377928 3266661,3273829,3730467,4805861,4806143,5534871,6371063,7834735,8926025,9293575,9664815,12629449,13645059,13645723,16510691,19947389,19952425,22519739,22520381,24820941,26657853,26658495 %N A377928 The indices k where A377015(k) = 1. %C A377928 These are the indices where a knight moving on a square spiral revisits the origin using the path rules given in A377015. See that sequence for further details. %Y A377928 Cf. A377015, A316667, A362027, A343678, A358278, A358150, A328929, A328909. %K A377928 nonn %O A377928 1,2 %A A377928 _Scott R. Shannon_, Nov 11 2024