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 A053717 a(n) = n^7 + n^6 + n^5 + n^4 + n^3 + n^2 + n + 1. 7
 1, 8, 255, 3280, 21845, 97656, 335923, 960800, 2396745, 5380840, 11111111, 21435888, 39089245, 67977560, 113522235, 183063616, 286331153, 435984840, 648232975, 943531280, 1347368421, 1891142968, 2613136835, 3559590240, 4785883225, 6357828776, 8353082583 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n) = 11111111 in base n for n>0. LINKS Index entries for linear recurrences with constant coefficients, signature (8,-28,56,-70,56,-28,8,-1). FORMULA a(n) = (n^8-1)/(n-1) for n != 1. G.f.: 1 -x*(x^7-8*x^6-57*x^5-1016*x^4-2297*x^3-1464*x^2-191*x-8)/(x-1)^8. - Colin Barker, Oct 29 2012 EXAMPLE a(3) = 3280 because 11111111 base 3 = 2187+729+243+81+27+9+3+1 = 3280. MATHEMATICA Table[FromDigits["11111111", n], {n, 1, 30}] (* or *) Table[n^7+n^6+n^5+n^4+n^3+n^2+n+1, {n, 1, 60}] (* Vladimir Joseph Stephan Orlovsky, Jan 29 2012 *) CROSSREFS Sequence in context: A226428 A277421 A171612 * A267250 A034674 A317511 Adjacent sequences:  A053714 A053715 A053716 * A053718 A053719 A053720 KEYWORD nonn,base,easy,changed AUTHOR Henry Bottomley, Mar 23 2000 EXTENSIONS a(0)=1 prepended by Alois P. Heinz, May 04 2021 STATUS approved

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Last modified May 14 04:27 EDT 2021. Contains 343872 sequences. (Running on oeis4.)