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 A179541 #7 Jun 02 2025 03:01:35 %S A179541 1,1,1,1,2,2,1,1,3,2,4 %N A179541 a(n) is the least possible smallest period attainable by the action of a periodic sequence of binary operations <+>,<-> (see A179382,A179480), beginning with 2n-1<+>1 or 2n-1<->1. %C A179541 The minorizing sequence for all sequences of type A179382,A179480 with arbitrary periodic rotation of the binary operations <+>,<->. %e A179541 Let n=12, 2n-1=23. Considering periodic sequence <+>,<->,<+>,<->,..., we have 23<+>1=3, 23<->3=5, 23<+>5=7, 23<->7=1, 23<+>1=3,... Thus a(12)<=4. It is not difficult to verify that a(12)>3. Thus a(12)=4. %Y A179541 Cf. A179382 A179480 %K A179541 nonn %O A179541 2,5 %A A179541 _Vladimir Shevelev_, Jul 18 2010