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A013713
a(n) = 8^(2n+1).
5
8, 512, 32768, 2097152, 134217728, 8589934592, 549755813888, 35184372088832, 2251799813685248, 144115188075855872, 9223372036854775808, 590295810358705651712, 37778931862957161709568, 2417851639229258349412352
OFFSET
0,1
COMMENTS
Additive digital root of a(n) = 8. - Miquel Cerda, Jul 03 2016
FORMULA
a(n) = 64a(n-1), n>0. O.g.f.: 8/(1-64x). - R. J. Mathar, May 07 2008
a(n) = 8*A089357(n) = 2*A013734(n) = A013735(n)/2 . - Philippe Deléham, Nov 24 2008
From Ilya Gutkovskiy, Jul 03 2016: (Start)
E.g.f.: 8*exp(64*x).
a(n) = A001018(A005408(n)). (End)
MATHEMATICA
8^(2*Range[0, 20]+1) (* or *) NestList[64#&, 8, 20] (* Harvey P. Dale, Feb 27 2013 *)
PROG
(Magma) [8^(2*n+1): n in [0..20]]; // Vincenzo Librandi, May 25 2011
(PARI) x='x+O('x^99); Vec(8/(1-64*x)) \\ Altug Alkan, Jul 09 2016
(PARI) a(n)=8<<(3*n) \\ Charles R Greathouse IV, Jul 11 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved