cp's OEIS Frontend

A230424 a(n) = largest natural number x such that x=n+A034968(x), or zero if no such number exists.

%I A230424 #12 Aug 11 2015 01:32:20
%S A230424 1,3,5,0,0,7,9,11,0,0,13,15,17,0,0,19,21,23,0,0,0,0,0,25,27,29,0,0,31,
%T A230424 33,35,0,0,37,39,41,0,0,43,45,47,0,0,0,0,0,49,51,53,0,0,55,57,59,0,0,
%U A230424 61,63,65,0,0,67,69,71,0,0,0,0,0,73,75,77,0,0,79
%N A230424 a(n) = largest natural number x such that x=n+A034968(x), or zero if no such number exists.
%H A230424 Antti Karttunen, <a href="/A230424/b230424.txt">Table of n, a(n) for n = 0..10079</a>
%F A230424 a(n) = A230412(n)*(A230423(n)+1).
%o A230424 (Scheme)
%o A230424 (define (A230424 n) (if (zero? n) 1 (let ((v (A230423 n))) (if (zero? v) v (+ 1 v)))))
%Y A230424 Cf. A034968, A230414. a(A219650(n)) = A005408(n) = 2n+1.
%Y A230424 One more than A230423 at its nonzero points. A219658 gives the positions of zeros. Can be used to compute A230425-A230427.
%Y A230424 Analogous sequence for binary system: A213724.
%K A230424 nonn
%O A230424 0,2
%A A230424 _Antti Karttunen_, Oct 31 2013