%I A135518
%S A135518 1,16,241,3616,54241,813616,12204241,183063616,2745954241,41189313616,
%T A135518 617839704241,9267595563616,139013933454241,2085209001813616,
%U A135518 31278135027204241,469172025408063616,7037580381120954241
%N A135518 Generalized repunits in base 15.
%C A135518 Primes in this sequence are given in A006033.
%F A135518 a(n) = (15^n-1)/14
%F A135518 a(n)=15*a(n-1)+1 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Oct 29 2009] - Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 
               29 2009
%e A135518 a(4) = 15^3+15^2+15^1+1 = 3375+225+15+1 = 3616
%e A135518 For n=2, a(2)=15*1+1=16; n=3, a(3)=15*16+1=241; n=4, a(4)=15*241+1=3616 
               [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 29 2009]
%o A135518 (Other) sage: [gaussian_binomial(n,1,15) for n in xrange(1,15)] # [From 
               Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 28 2009]
%Y A135518 Cf. A000225, A003462, A002450, A003463, A003464, A023000, A023001, A002452, 
               A016123, A016125.
%Y A135518 Sequence in context: A063814 A058667 A005619 this_sequence A064232 A074153 
               A119933
%Y A135518 Adjacent sequences: A135515 A135516 A135517 this_sequence A135519 A135520 
               A135521
%K A135518 nonn
%O A135518 1,2
%A A135518 Julien Peter Benney (jpbenney(AT)gmail.com), Feb 19 2008
%E A135518 More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 
               29 2009