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 A264988 #11 Dec 03 2015 04:36:27 %S A264988 0,1,3,5,7,13,17,19,23,27,29,31,35,37,41,43,51,53,57,59,61,65,67,71, %T A264988 73,77,79,143,149,151,155,157,161,163,173,177,179,181,185,191,193,199, %U A264988 203,209,211,215,219,223,231,233,237,239,241,249,251,263,267,269,271,277,285,291,293,299,303,315,317,321,327,333,335,337,341,347,349,357,359,369,517,531,535,523,527 %N A264988 The left edge of A263267. %C A264988 The first point where the sequence is nonmonotonic is the dip from a(80) = 535 to a(81) = 523. %H A264988 Antti Karttunen, <a href="/A264988/b264988.txt">Table of n, a(n) for n = 0..10001</a> %F A264988 a(0) = 0; for n >= 1, a(n) = A263267(A263260(n-1)). %F A264988 Other identities. For all n >= 0: %F A264988 A155043(a(n)) = n. %F A264988 a(A262508(n)) = A262509(n) = A263269(A262508(n)). [In case A262508 and A262509 are infinite sequences.] %o A264988 (Scheme) %o A264988 (define (A264988 n) (if (zero? n) n (A263267 (A263260 (- n 1))))) %Y A264988 Cf. A263260, A262508, A262509. %Y A264988 The left edge of irregular table A263267. %Y A264988 Cf. A263269 (the other edge). %Y A264988 Differs from A261089 for the first time at n=69, where a(69) = 333, while A261089(69) = 331. %K A264988 nonn %O A264988 0,3 %A A264988 _Antti Karttunen_, Nov 29 2015