cp's OEIS Frontend

A175859 a(n) = numbers k in increasing order such that A175856(m) = k has no solution for any m, where A175856(m): a(m) = m for m = noncomposites, a(m) = previous term - 1 for m = composites.

%I A175859 #7 Nov 08 2018 21:12:40
%S A175859 8,9,14,15,24,25,32,33,38,39,54,55,62,63,74,75,90,91,92,93,98,99,114,
%T A175859 115,116,117,118,119,120,121,122,123,140,141,142,143,144,145,158,159,
%U A175859 182,183,184,185,186,187,212,213
%N A175859 a(n) = numbers k in increasing order such that A175856(m) = k has no solution for any m, where A175856(m): a(m) = m for m = noncomposites, a(m) = previous term - 1 for m = composites.
%C A175859 Absent positive integers (pairs of consecutive numbers) in sequence A175856(n).
%C A175859 Complement of A175857(n).
%C A175859 A175860(a(n)) = 0, A175861(a(n)) = 1, A175862(a(n)) = 0.
%H A175859 Antti Karttunen, <a href="/A175859/b175859.txt">Table of n, a(n) for n = 1..22312</a>
%F A175859 a(2k) = a(2k-1) + 1 for k >= 1.
%Y A175859 Cf. A175856, A175857, A175858, A175860, A175861, A175862.
%K A175859 nonn
%O A175859 1,1
%A A175859 _Jaroslav Krizek_, Sep 29 2010