Search: id:A141468
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%I A141468
%S A141468 0,1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,
%T A141468 36,38,39,40,42,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,64,65,
%U A141468 66,68,69,70,72,74,75,76,77,78,80,81,82,84,85,86,87,88
%N A141468 Zero together with the nonprime numbers A018252.
%C A141468 0 and 1 together with the composite numbers (A002808). [From Omar E. 
               Pol (info(AT)polprimos.com), Jul 04 2009]
%C A141468 A141468 U A000040 = A001477 = A158611 U A002808. [From Juri-Stepan Gerasimov 
               (2stepan(AT)rambler.ru), Jul 28 2009, Sep 27 2009]
%C A141468 Contribution from Omar E. Pol (info(AT)polprimos.com), Aug 13 2009: (Start)
%C A141468 The sequence of nonprime numbers (A018252) starts: 1,4,6,8,9,10,12,14,
               15,... (Offset=1). Note that zero is not a member of A018252 because 
               the words "prime" and "nonprime" normally refer to the natural numbers 
               or positive integers (1,2,3,4,5,6,...).
%C A141468 We know that the n-th nonprime is A018252(n). Then, about this sequence 
               (A141468 with offset=1), we can write: A141468(n+1) = A018252(n), 
               (See example and formula). (End)
%C A141468 Largest nonprime<nth nonprime (cf.A018252). [From Juri-Stepan Gerasimov 
               (2stepan(AT)rambler.ru), Oct 29 2009]
%C A141468 The nonnegative nonprimes. If nonprime numbers A141468 which are also 
               the nonnegative integers, then the nonprimes A141468 also called 
               the nonnegative nonprimes and the nonprimes A018252 also called the 
               natural nonprimes, the whole nonprimes, the counting nonprimes. [From 
               Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Nov 22 2009]
%H A141468 N. J. A. Sloane, <a href="b141468.txt">Table of n, a(n) for n = 1..17739</
               a>
%F A141468 a(1)=0. a(n)=A018252(n-1), n>1. [From Omar E. Pol (info(AT)polprimos.com), 
               Aug 13 2009]
%e A141468 Contribution from Omar E. Pol (info(AT)polprimos.com), Aug 13 2009: (Start)
%e A141468 ==============================
%e A141468 .................... The n-th
%e A141468 n ...... a(n) ...... nonprime
%e A141468 ==============================
%e A141468 1 ....... 0 ........... 1
%e A141468 2 ....... 1 ........... 4
%e A141468 3 ....... 4 ........... 6
%e A141468 4 ....... 6 ........... 8
%e A141468 5 ....... 8 ........... 9
%e A141468 6 ....... 9 .......... 10
%e A141468 (End)
%Y A141468 Cf. A018252.
%Y A141468 Cf. A002808. [From Omar E. Pol (info(AT)polprimos.com), Jul 04 2009]
%Y A141468 Sequence in context: A088224 A002808 A018252 this_sequence A077091 A051035 
               A046349
%Y A141468 Adjacent sequences: A141465 A141466 A141467 this_sequence A141469 A141470 
               A141471
%K A141468 nonn,new
%O A141468 1,3
%A A141468 Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 11 2008
%E A141468 Added 68 by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 14 2008
%E A141468 Better definition from Omar E. Pol (info(AT)polprimos.com), Jun 30 2009

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