

A033953


Write 0,1,2,... in a clockwise spiral on a square lattice, writing each digit at a separate lattice point, starting with 0 at the origin and 1 at x=0, y=1; sequence gives the numbers on the positive xaxis.


11



0, 7, 1, 7, 4, 2, 8, 1, 1, 3, 1, 2, 0, 2, 3, 1, 3, 4, 6, 5, 5, 5, 7, 7, 8, 8, 9, 6, 8, 1, 1, 1, 2, 3, 1, 8, 0, 6, 1, 7, 0, 9, 2, 8, 4, 3, 2, 1, 1, 7, 2, 6, 2, 1, 3, 3, 5, 5, 3, 2, 2, 0, 4, 3, 2, 5, 4, 6, 5, 0, 5, 1, 1, 6, 5, 8, 1, 2, 6, 7, 3, 8, 7, 8, 9, 5, 7, 1, 8, 2, 8, 6, 1, 9, 9, 3, 6, 7, 9, 0, 1, 4, 6, 1, 0
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OFFSET

0,2


LINKS



FORMULA



EXAMPLE

2324252
 
2 13141 6
   
2 2 456 5 2
     
1 1 3 0 7 1 7
      
2 1 21 8 6 2
    
0 1019 1 8
  
291817 2
We begin with the 0 and wrap the numbers 1 2 3 4 ... around it. Then the sequence is obtained by reading rightwards, starting from the initial 0.  Andrew Woods, May 20 2012


MATHEMATICA

nmax = 105; A033307 = Flatten[IntegerDigits /@ Range[0, nmax^2 + 10 nmax]];


CROSSREFS



KEYWORD

nonn,base,easy,nice


AUTHOR



EXTENSIONS

More terms from Andrew J. Gacek (andrew(AT)dgi.net)


STATUS

approved



