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Search: id:A001273
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| A001273 |
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Smallest number that takes n steps to reach 1 under iteration of sum-of-squares-of-digits map (the next term is 3788 followed by 973 9's and is too large to include here). |
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+0
5
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OFFSET
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0,2
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COMMENT
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Also known as the smallest happy numbers of height n.
a(8)= 3788 followed by 973 9's, a(9)= 237 followed by 4.6777777.......77777 x 10^974 9's - Sergio Pimentel (ferdiego(AT)suddenlink.net), Feb 21 2007
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REFERENCES
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R. K. Guy, Unsolved Problems Number Theory, Sect. E34.
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CROSSREFS
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Cf. A007770, A018785.
Sequence in context: A129075 A095918 A018785 this_sequence A111524 A074346 A126973
Adjacent sequences: A001270 A001271 A001272 this_sequence A001274 A001275 A001276
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KEYWORD
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base,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Jud McCranie (j.mccranie(AT)comcast.net) Sep 15 1994.
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