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 A099672 Partial sums of repdigits of A002279. 1
 5, 60, 615, 6170, 61725, 617280, 6172835, 61728390, 617283945, 6172839500, 61728395055, 617283950610, 6172839506165, 61728395061720, 617283950617275, 6172839506172830, 61728395061728385, 617283950617283940, 6172839506172839495, 61728395061728395050 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Colin Barker, Table of n, a(n) for n = 1..999 Index entries for linear recurrences with constant coefficients, signature (12,-21,10). FORMULA a(n) = (5/81)*(10^(n+1) - 9*n - 10). - R. Piyo (nagoya314(AT)yahoo.com), Dec 10 2004. From Colin Barker, Nov 30 2017: (Start) G.f.: 5*x / ((1 - x)^2*(1 - 10*x)). a(n) = 12*a(n-1) - 21*a(n-2) + 10*a(n-3) for n>2. (End) EXAMPLE 5 + 55 + 555 + 5555 + 55555 = a(5) = 61725. MATHEMATICA <

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Last modified February 21 03:02 EST 2020. Contains 332086 sequences. (Running on oeis4.)