%I A033988
%S A033988 0,5,1,4,3,7,8,0,4,7,7,1,2,6,2,1,8,7,4,2,6,1,8,9,2,7,6,0,6,5,1,2,0,4,1,
%T A033988 5,8,5,1,8,8,8,2,1,2,3,2,4,9,0,2,8,9,9,3,3,2,0,3,7,9,3,4,2,8,8,4,7,1,5,
%U A033988 5,3,7,4,5,9,7,5,6,5,9,8,7,1,5,3,7,8,4,0,8,5,6,9,9,3,1,0,9,8,1,1,6,9,9
%N A033988 Write 0,1,2,... in clockwise spiral, writing each digit in separate square; 
               sequence gives numbers on positive y axis.
%C A033988 In other words, write 0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 
               ... in a clockwise spiral, starting with the 0.
%e A033988 ............
%e A033988 ...131416...
%e A033988 ...245652...
%e A033988 ...130717...
%e A033988 ...121862...
%e A033988 ...101918...
%e A033988 ............
%e A033988 We begin with the 0 and wrap the numbers 1 2 3 4 ... around it
%e A033988 After one loop we have reached
%e A033988 456
%e A033988 307
%e A033988 218
%e A033988 After two loops we see
%e A033988 13141
%e A033988 24565
%e A033988 13071
%e A033988 12186
%e A033988 10191
%e A033988 and so on.
%e A033988 Then the sequence is obtained by reading vertically upwards, starting 
               from the initial 0.
%Y A033988 Sequences from spirals: A001107, A002939, A007742, A033951, A033952, 
               A033953, A033954, A033989, A033990, A033991, A002943, A033996, A033988.
%Y A033988 Sequence in context: A108170 A086988 A010132 this_sequence A019977 A068468 
               A011301
%Y A033988 Adjacent sequences: A033985 A033986 A033987 this_sequence A033989 A033990 
               A033991
%K A033988 nonn,easy,base
%O A033988 0,2
%A A033988 N. J. A. Sloane (njas(AT)research.att.com).
%E A033988 More terms from Andrew Gacek (andrew(AT)dgi.net).