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A003620
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Number of iterations until 3n reaches 153 under x goes to sum of cubes of digits map.
(Formerly M2829)
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1
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3, 10, 4, 5, 10, 2, 5, 3, 2, 3, 6, 6, 6, 3, 5, 6, 10, 5, 5, 10, 6, 6, 6, 2, 5, 8, 2, 6, 8, 4, 6, 6, 4, 5, 10, 2, 4, 7, 11, 5, 7, 9, 10, 7, 1, 6, 7, 11, 7, 10, 0, 6, 8, 9, 6, 4, 11, 7, 13, 2, 6, 4, 4, 10, 8, 4, 5, 3, 2, 5, 7, 9, 10, 4, 8, 8, 7, 5, 10, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) = A165331(A008585(n)). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 21 2009]
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REFERENCES
| J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 13.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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MATHEMATICA
| Table[Length[NestWhileList[Total[IntegerDigits[#]^3]&, 3n, #!=153&]]-1, {n, 80}] (* From Harvey P. Dale, Dec 19 2011 *)
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CROSSREFS
| Cf. A055012. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 21 2009]
Sequence in context: A072988 A170855 A131814 * A192028 A111229 A100984
Adjacent sequences: A003617 A003618 A003619 * A003621 A003622 A003623
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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