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 A099671 Partial sums of repdigits of A002278. 0
 4, 48, 492, 4936, 49380, 493824, 4938268, 49382712, 493827156, 4938271600, 49382716044, 493827160488, 4938271604932, 49382716049376, 493827160493820, 4938271604938264, 49382716049382708, 493827160493827152 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = (4/81)*(10^(n+1) - 9*n - 10). - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004 From Chai Wah Wu, Feb 28 2018: (Start) a(n) = 12*a(n-1) - 21*a(n-2) + 10*a(n-3) for n > 3. G.f.: 4*x/((1 - x)^2*(1 - 10*x)). (End) EXAMPLE 4 + 44 + 444 + 4444 + 44444 = a(5) = 49380. MATHEMATICA <

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Last modified February 20 04:34 EST 2020. Contains 332063 sequences. (Running on oeis4.)