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 A099670 Partial sums of repdigits of A002277. 0

%I

%S 3,36,369,3702,37035,370368,3703701,37037034,370370367,3703703700,

%T 37037037033,370370370366,3703703703699,37037037037032,

%U 370370370370365,3703703703703698,37037037037037031,370370370370370364

%N Partial sums of repdigits of A002277.

%F a(n) = (3/81)*(10^(n+1) - 9*n - 10). - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004

%e 3+33+333+3333=a[4]=3702

%p a:=n->sum((10^(n-j)-1^(n-j))/3,j=0..n): seq(a(n), n=1..18); # _Zerinvary Lajos_, Jan 15 2007

%t <<NumberTheory`NumberTheoryFunctions` Table[{k, Table[Apply[Plus, Table[k*(10^n-1)/9, {n, 1, m}]], {m, 1, 35}]}, {k, 1, 9}]

%t Table[3/9*Sum[10^i - 1, {i, n}], {n, 18}] (* _Robert G. Wilson v_, Nov 20 2004 *)

%Y Cf. A057932, A002275-A002283.

%K nonn

%O 1,1

%A _Labos Elemer_, Nov 17 2004

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Last modified February 24 22:57 EST 2020. Contains 332216 sequences. (Running on oeis4.)