# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a227082 Showing 1-1 of 1 %I A227082 #13 Jul 03 2013 03:45:47 %S A227082 1,2,3,5,4,7,6,9,8,11,10,13,12,17,19,23,14,25,15,21,29,27,16,31,33,35, %T A227082 37,41,18,43,20,47,49,39,53,59,22,61,55,67,24,65,26,71,73,45,28,79,77, %U A227082 83,85,89,30,97,51,91,32,95,34,101,36,57,103,107,109,113,38,121,115,125,40,127,42,63,119,131,133,137,44,139,143,145,46,149 %N A227082 a(n) is the least positive integer not yet in the sequence coprime to a(d) for every proper divisor d of n. %C A227082 This is a permutation of the positive integers. %C A227082 The subsequence (a(prime(i))) is strictly increasing. %C A227082 a(i) < a(prime(j)) implies i < prime(j). %H A227082 Paul Tek, Table of n, a(n) for n = 1..10000 %H A227082 Paul Tek, PERL program for this sequence %e A227082 a(1) = min { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ... } = 1 %e A227082 a(2) = min { 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ... } = 2 %e A227082 a(3) = min { 3, 4, 5, 6, 7, 8, 9, 10, 11, ... } = 3 %e A227082 a(4) = min { 5, 7, 9, 11, ... } = 5 %e A227082 a(5) = min { 4, 6, 7, 8, 9, 10, 11, ... } = 4 %e A227082 a(6) = min { 7, 11, ... } = 7 %o A227082 (Perl) See Tek link. %Y A227082 Cf. A227142. %K A227082 nonn %O A227082 1,2 %A A227082 _Paul Tek_, Jun 30 2013 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE