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a(n) = 2 Pi * n rounded off.
1

%I #2 Feb 11 2014 19:05:31

%S 0,6,13,19,25,31,38,44,50,57,63,69,75,82,88,94,101,107,113,119,126,

%T 132,138,145,151,157,163,170,176,182,188,195,201,207,214,220,226,232,

%U 239,245,251

%N a(n) = 2 Pi * n rounded off.

%C If only integers are allowed in computations, a(n) gives the sequence of circumferences of circles in order of increasing radii.

%t Round[Table[2 Pi * n, {n, 0, 40}]]

%K easy,nonn

%O 1,2

%A _Joseph L. Pe_, Oct 03 2002