Search: id:A105366
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%I A105366
%S A105366 1,2,4,3,5,6,8,7,11,9,13,10,12,17,19,14,23,15,29,31,16,37,41,18,20,21,
%T A105366 43,47,22,24,53,59,25,61,26,67,27,71,73,28,79,30,83,32,33,89,97,101,103,
%U A105366 34,35,107,36,109,38,113,39,127,40,42
%N A105366 Rearrangement of positive integers according to parity of (prime(n)-1)/
               2 (see comments).
%C A105366 a(1)=1, for n>1: if (prime(n)-1)/2 is odd/even then a(n) is the next 
               prime/composite number.
%t A105366 p=Prime[Range[100]];s=Complement[Range[100], p]; bb={1};is=1;ip=0;Do[If[EvenQ[(Prime[i]-1)/
               2], is=is+1;bb=Append[bb, s[[is]]], ip=ip+1;bb=Append[bb, p[[ip]]]], 
               {i, 2, 60}];bb
%Y A105366 Cf. A105365.
%Y A105366 Sequence in context: A075618 A095689 A083194 this_sequence A077156 A132948 
               A102569
%Y A105366 Adjacent sequences: A105363 A105364 A105365 this_sequence A105367 A105368 
               A105369
%K A105366 nonn
%O A105366 1,2
%A A105366 Zak Seidov (zakseidov(AT)yahoo.com), Apr 01 2005

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