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Search: id:A003621
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| A003621 |
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Number of iterations until n reaches 1 or 4 under x goes to sum of squares of digits map.
(Formerly M4764)
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+0
12
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| 0, 1, 11, 0, 8, 13, 5, 9, 10, 1, 2, 9, 2, 10, 10, 7, 9, 9, 4, 1, 9, 10, 3, 2, 7, 9, 10, 3, 6, 11, 2, 3, 10, 8, 9, 12, 6, 7, 11, 8, 10, 2, 8, 4, 11, 8, 9, 10, 4, 8, 10, 7, 9, 11, 9, 8, 10, 5, 8, 13, 7, 9, 12, 8, 8, 11, 6, 2, 12, 5, 9, 10, 6, 9, 10, 6, 5, 4, 3, 9
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
A. Porges, A set of eight numbers, Amer. Math. Monthly, 52 (1945), 379-382.
J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 13.
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CROSSREFS
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A000216, A000218, etc.
Sequence in context: A110408 A138066 A115595 this_sequence A055963 A127805 A088621
Adjacent sequences: A003618 A003619 A003620 this_sequence A003622 A003623 A003624
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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