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A001370
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Sum of digits of 2^n.
(Formerly M1085 N0414)
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21
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1, 2, 4, 8, 7, 5, 10, 11, 13, 8, 7, 14, 19, 20, 22, 26, 25, 14, 19, 29, 31, 26, 25, 41, 37, 29, 40, 35, 43, 41, 37, 47, 58, 62, 61, 59, 64, 56, 67, 71, 61, 50, 46, 56, 58, 62, 70, 68, 73, 65, 76, 80, 79, 77, 82, 92, 85, 80, 70, 77
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Same digital roots as A065075 (Sum of digits of the sum of the preceding numbers) and A004207 (sum of digits of all previous terms); they enter into the cycle {1 2 4 8 7 5}. - Alexandre wajnberg (alexandre.wajnberg(AT)skynet.be), Dec 11 2005
a(n) ~ n*e/2 where e is the base of the natural logarithm 2,7182... [From Ctibor O. Zizka (c.zizka(AT)email.cz), Sep 11 2010]
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REFERENCES
| Archimedeans Problems Drive, Eureka, 26 (1963), 12.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Zak Seidov, Table of n, a(n) for n = 0..10000.
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CROSSREFS
| Sequence in context: A153130 A021406 A065075 * A195715 A039794 A113417
Adjacent sequences: A001367 A001368 A001369 * A001371 A001372 A001373
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KEYWORD
| base,nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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