%I A102885
%S A102885 1,2,1,2,3,3,4,4,5,6,7,5,8,6,9,10,11,7,12,8,13,14,15,9,16,17,18,19,20,
%T A102885 10,21,11,22,23,24,25,26,12,27,28,29,13,30,14,31,32,33,15,34,35,36,37,
%U A102885 38,16,39,40,41,42,43,17,44,18,45,46,47,48,49,19,50,51,52,20,53,21,54
%N A102885 Index of n in the primes A000040 or nonprimes A141468.
%C A102885 The nonnegative numbers n occur exactly once in either A000040 or A141468. 
               The sequence lists the corresponding index. It is a permutation of 
               A008619.
%F A102885 A141468(a(n))=n or A000040(a(n))=n.
%Y A102885 Cf. A141468, A000040, A026233.
%Y A102885 Sequence in context: A129636 A048219 A087188 this_sequence A138585 A070048 
               A116498
%Y A102885 Adjacent sequences: A102882 A102883 A102884 this_sequence A102886 A102887 
               A102888
%K A102885 nonn,easy
%O A102885 0,2
%A A102885 Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 17 2008
%E A102885 Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 19 2008