login
Consider the sequence {b(n), n >= 1} of digits of the natural (or counting) numbers: 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0... (A007376); a(n) = n*b(n).
1

%I #4 Mar 31 2012 14:11:36

%S 1,4,9,16,25,36,49,64,81,10,0,12,13,14,30,16,51,18,76,20,105,22,138,

%T 24,175,26,216,28,261,60,0,64,33,68,70,72,111,76,156,80,205,84,258,88,

%U 315,92,376,96,441,150,0,156,53,162,110,168,171,174,236,180,305,186,378,192

%N Consider the sequence {b(n), n >= 1} of digits of the natural (or counting) numbers: 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0... (A007376); a(n) = n*b(n).

%Y Cf. A098727, etc.

%K base,easy,nonn

%O 1,2

%A _Alexandre Wajnberg_, Sep 30 2004

%E More terms from _Joshua Zucker_, May 18 2006