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A066003
Sum of digits of 7^n.
20
1, 7, 13, 10, 7, 22, 28, 25, 31, 28, 43, 49, 37, 52, 58, 64, 52, 58, 73, 79, 76, 82, 97, 85, 73, 97, 112, 91, 133, 121, 118, 115, 103, 127, 142, 157, 136, 115, 130, 136, 142, 148, 136, 169, 175, 163, 187, 175, 136, 178, 184, 217, 196, 220, 217
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OFFSET
0,2
LINKS
Harry J. Smith,
Table of n, a(n) for n=0,...,1000
FORMULA
a(n) =
A007953
(
A000420
(n)). -
Michel Marcus
, Nov 01 2013
MATHEMATICA
Table[Total[IntegerDigits[7^n]], {n, 55}] (*
Harvey P. Dale
, Nov 22 2010 *)
PROG
(Magma) [ &+Intseq(7^n): n in [0..60] ];
(PARI) a(n) = sumdigits(7^n); \\
Michel Marcus
, Nov 01 2013
CROSSREFS
Cf.
A000420
(7^n),
A007953
(sum of digits).
Cf. sum of digits of k^n:
A001370
(k=2),
A004166
(k=3),
A065713
(k=4),
A066001
(k=5),
A066002
(k=6), this sequence (k=7),
A066004
(k=8),
A065999
(k=9),
A066005
(k=11),
A066006
(k=12),
A175527
(k=13).
Sequence in context:
A365346
A215990
A122874
*
A115858
A114389
A259232
Adjacent sequences:
A066000
A066001
A066002
*
A066004
A066005
A066006
KEYWORD
nonn
,
base
AUTHOR
N. J. A. Sloane
, Dec 11 2001
STATUS
approved
