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A264988 The left edge of A263267. 4


%S 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 73,77,79,143,149,151,155,157,161,163,173,177,179,181,185,191,193,199,

%U 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 The left edge of A263267.

%C The first point where the sequence is nonmonotonic is the dip from a(80) = 535 to a(81) = 523.

%H Antti Karttunen, <a href="/A264988/b264988.txt">Table of n, a(n) for n = 0..10001</a>

%F a(0) = 0; for n >= 1, a(n) = A263267(A263260(n-1)).

%F Other identities. For all n >= 0:

%F A155043(a(n)) = n.

%F a(A262508(n)) = A262509(n) = A263269(A262508(n)). [In case A262508 and A262509 are infinite sequences.]

%o (Scheme)

%o (define (A264988 n) (if (zero? n) n (A263267 (A263260 (- n 1)))))

%Y Cf. A263260, A262508, A262509.

%Y The left edge of irregular table A263267.

%Y Cf. A263269 (the other edge).

%Y Differs from A261089 for the first time at n=69, where a(69) = 333, while A261089(69) = 331.

%K nonn

%O 0,3

%A _Antti Karttunen_, Nov 29 2015

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)