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 A125682 a(n) = (6^n-1)*3/5. 2
 3, 21, 129, 777, 4665, 27993, 167961, 1007769, 6046617, 36279705, 217678233, 1306069401, 7836416409, 47018498457, 282110990745, 1692665944473, 10155995666841, 60935974001049, 365615844006297, 2193695064037785, 13162170384226713, 78973022305360281 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The base 6 numbers 3, 33, 333, 3333, 33333, 333333, ... converted to base 10. LINKS Bruno Berselli, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (7,-6). FORMULA G.f.: 3*x/((1-x)*(1-6*x)). [Bruno Berselli, Apr 18 2012] EXAMPLE Base 6        Base 10 3 ............. 3 = 3*6^0 33 ........... 21 = 3*6^1+3*6^0 333 ......... 129 = 3*6^2+3*6^1+3*6^0 3333 ........ 777 = 3*6^3+3*6^2+3*6^1+3*6^0, etc. MAPLE seq((6^n-1)*3/5, n=1..27); PROG (MAGMA) [(6^n-1)*3/5: n in [1..22]]; // Bruno Berselli, Apr 18 2012 CROSSREFS Cf. A003464, A005610, A125687, A024062, A105281, A146884. Sequence in context: A273803 A036754 A121447 * A125701 A274586 A124812 Adjacent sequences:  A125679 A125680 A125681 * A125683 A125684 A125685 KEYWORD nonn,easy AUTHOR Zerinvary Lajos, Jan 31 2007 EXTENSIONS Edited by N. J. A. Sloane, Feb 02 2007 Definition rewritten (with Lajos formula) from Bruno Berselli, Apr 18 2012 STATUS approved

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Last modified October 22 10:24 EDT 2019. Contains 328317 sequences. (Running on oeis4.)