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 A381660 #10 Mar 04 2025 07:33:06 %S A381660 1,1,1,3,15,2,1,1,3,9,43,26,28,15,4,36,18,25,6,25,31,20,70,46,26,352, %T A381660 114,11,19,23,49,56,70,15,56,79,46,409,29,48,24,48,52,16,77,11,123,16, %U A381660 78,73,48,44,49,31,11,178,330,305,180,454,147,45,158,280,108,296,53,13,22,4,184,145,99,86,114,6,42,41,248,76,570,54,204,25,125,522,110 %N A381660 The value k such that n = a(j) = a(j+k) = a(j+2*k) in A381658. %C A381660 The last known term that equals 1 is a(112). See A381658. %H A381660 Scott R. Shannon, <a href="/A381660/b381660.txt">Table of n, a(n) for n = 1..250</a> %Y A381660 Cf. A381658, A381659, A092482, A381597, A229037. %K A381660 nonn %O A381660 1,4 %A A381660 _Scott R. Shannon_, Mar 04 2025