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A015009 q-factorial numbers for q=10. 3
1, 11, 1221, 1356531, 15072415941, 1674711207620451, 1860790044610366931061, 20675444733360738721748118771, 2297271634742810443154153338805764581, 2552524038347870310755413660544832496799359491, 28361378203581611893021499527080870668821235178133404501 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..40

Index entries for sequences related to factorial numbers

FORMULA

a(n) = Product_{k=1..n} (q^k - 1)/(q - 1) with q=10.

a(1) = 1, a(n) = (10^n - 1)*a(n-1)/9. - Vincenzo Librandi, Oct 26 2012

MATHEMATICA

RecurrenceTable[{a[1]==1, a[n]==((10^n-1) * a[n-1])/9}, a, {n, 15}] (* Vincenzo Librandi, Oct 26 2012 *)

Table[QFactorial[n, 10], {n, 15}] (* Bruno Berselli, Aug 14 2013 *)

PROG

(MAGMA) [n le 1 select 1 else (10^n-1)*Self(n-1)/9: n in [1..15]]; // Vincenzo Librandi, Oct 26 2012

CROSSREFS

Sequence in context: A261138 A259937 A078269 * A068326 A001323 A266368

Adjacent sequences:  A015006 A015007 A015008 * A015010 A015011 A015012

KEYWORD

nonn,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified September 27 19:04 EDT 2020. Contains 337388 sequences. (Running on oeis4.)