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 A278538 #29 Apr 25 2024 10:33:12 %S A278538 1,1,2,1,2,1,3,1,3,1,2,1,4,1,4,1,2,1,5,1,3,1,2,1,5,1,6,1,2,1,6,1,3,1, %T A278538 2,1,4,1,7,1,2,1,7,1,3,1,2,1,8,1,5,1,2,1,4,1,3,1,2,1,8,1,9,1,2,1,9,1, %U A278538 3,1,2,1,6,1,4,1,2,1,10,1,3,1,2,1,5,1,10,1,2,1,11,1,3,1,2,1,4,1,7,1,2,1,11,1,3,1,2,1,12,1,5,1,2,1,4,1,3,1,2,1 %N A278538 a(n) = index of the row where n is located in array A278505. %C A278538 Ordinal transform of A278539 (most likely, but hinges on that also the columns of A278505 are strictly growing). %H A278538 Antti Karttunen, <a href="/A278538/b278538.txt">Table of n, a(n) for n = 1..10707</a> %H A278538 <a href="/index/J#Josephus">Index entries for sequences related to the Josephus Problem</a> %F A278538 If A278169(n) = 1, a(n) = A100617(n), otherwise a(n) = A278528(n). %F A278538 If n = A000960(k), a(n) = k, otherwise a(n) = number of the round in which n is removed in the Flavius sieve. %o A278538 (Scheme) %o A278538 (define (A278538 n) (if (not (zero? (A278169 n))) (A100617 n) (A278528 n))) %Y A278538 Cf. A000960, A100617, A278169, A278505, A278507, A278536, A278537, A278539. %K A278538 nonn %O A278538 1,3 %A A278538 _Antti Karttunen_, Nov 23 2016