The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A024062 a(n) = 6^n - 1. 9
 0, 5, 35, 215, 1295, 7775, 46655, 279935, 1679615, 10077695, 60466175, 362797055, 2176782335, 13060694015, 78364164095, 470184984575, 2821109907455, 16926659444735, 101559956668415, 609359740010495, 3656158440062975, 21936950640377855, 131621703842267135 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS In base 6 these are 0, 5, 55, 555, ... - David Rabahy, Dec 12 2016 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..500 Amelia Carolina Sparavigna, The groupoids of Mersenne, Fermat, Cullen, Woodall and other Numbers and their representations by means of integer sequences, Politecnico di Torino, Italy (2019), [math.NT]. Amelia Carolina Sparavigna, Some Groupoids and their Representations by Means of Integer Sequences, International Journal of Sciences (2019) Vol. 8, No. 10. Index entries for linear recurrences with constant coefficients, signature (7,-6). FORMULA G.f.: 1/(1 - 6*x) - 1/(1 - x). - Mohammad K. Azarian, Jan 14 2009 E.g.f.: exp(6*x) - exp(x). - Mohammad K. Azarian, Jan 14 2009 a(n+1) = 6*a(n) + 5, with a(0) = 0. - Reinhard Zumkeller, Nov 22 2009 a(n) = Sum_{i = 1..n} 5^i*binomial(n, n - i) for n > 0, a(0) = 0. - Bruno Berselli, Nov 11 2015 Sum_{n>=1} 1/a(n) = A248723. - Amiram Eldar, Nov 13 2020 MATHEMATICA 6^Range[0, 19] - 1 (* Alonso del Arte, Feb 22 2019 *) PROG (MAGMA) [6^n-1: n in [0..25]]; // Vincenzo Librandi, Jul 03 2011 (PARI) a(n)=6^n-1 \\ Charles R Greathouse IV, Dec 12 2016 (Scala) ((List.fill(24)(6L)).scanLeft(1L)(_ * _)).map(_ - 1L) // Alonso del Arte, Feb 22 2019 CROSSREFS Cf. A000400, A002279, A248723. Sequence in context: A038143 A221578 A320071 * A180250 A002074 A187444 Adjacent sequences:  A024059 A024060 A024061 * A024063 A024064 A024065 KEYWORD nonn,easy AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 18 17:28 EST 2021. Contains 340254 sequences. (Running on oeis4.)