%I A033990
%S A033990 0,1,1,8,3,7,6,2,1,5,1,1,6,2,2,1,3,4,0,4,5,3,6,7,0,8,9,1,4,6,1,2,7,1,1,
%T A033990 4,4,8,1,7,4,7,2,0,8,8,2,4,4,1,2,8,4,6,3,2,7,3,3,7,3,2,4,1,2,3,4,7,5,6,
%U A033990 5,2,0,1,5,8,9,8,6,4,1,7,6,1,7,8,7,7,5,1,8,4,7,6,9,2,2,3,9,0,1,0,1,6,8
%N A033990 Write 0,1,2,... in clockwise spiral, writing each digit in separate square; 
               sequence gives numbers on negative y axis.
%C A033990 Consider array of digits 0_(1)23456789(1)0111213141516171(8)1920212223....; 
               in this array add to n-th pointer 8.n+1 to get next pointer. E.g. 
               n=1 so n+(8.1+1)=10 -> n=10 so n+(8.2+1)=27 -> n=27 so ... etc. - 
               comment from Patrick De Geest.
%e A033990 131416...
%e A033990 245652...
%e A033990 130717...
%e A033990 121862...
%e A033990 101918...
%Y A033990 Sequences from spirals: A001107, A002939, A007742, A033951, A033952, 
               A033953, A033954, A033989, A033990, A033991, A002943, A033996, A033988.
%Y A033990 Sequence in context: A132035 A153813 A131654 this_sequence A099284 A061444 
               A011214
%Y A033990 Adjacent sequences: A033987 A033988 A033989 this_sequence A033991 A033992 
               A033993
%K A033990 nonn,base,easy,nice
%O A033990 0,4
%A A033990 N. J. A. Sloane (njas(AT)research.att.com).
%E A033990 More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 
               1999.
%E A033990 Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Nov 
               01 2009