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A055629
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Beginning of first run of at least n consecutive happy numbers.
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3
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OFFSET
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1,2
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COMMENTS
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This sequence is infinite - see Theorem 3.1 of El-Sedy & Siksek.
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LINKS
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Table of n, a(n) for n=1..7.
H. G. Grundman, E. A. Teeple, Sequences of consecutive happy numbers, Rocky Mountain J. Math. 37 (6) (2007) 1905-1916.
Hao Pan, On consecutive happy numbers, J. Numb. Theory 128 (6) (2008) 1646-1654.
Esam El-Sedy and Samir Siksek, On happy numbers, Rocky Mountain J. Math. 30 (2000), 565-570.
R. Styer, Smallest Examples of Strings of Consecutive Happy Numbers, J. Int. Seq. 13 (2010), 10.6.3.
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EXAMPLE
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Lambert Klasen (lambert.klasen(AT)postmaster.co.uk), Oct 17 2004: with notation {9:repeat_count_of_digit_nine}, a(8) = 58{9:11}6{9:143}95, a(9) = 16{9:179}4{9:87}95, a(10) = 16{9:181}5{9:696}95.
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CROSSREFS
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Cf. A007770.
Sequence in context: A049081 A069432 A338533 * A131751 A042863 A042860
Adjacent sequences: A055626 A055627 A055628 * A055630 A055631 A055632
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KEYWORD
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base,nonn
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AUTHOR
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David W. Wilson, Jun 05 2000
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EXTENSIONS
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The next term a(8) is too large to include.
Entry corrected by Sergio Pimentel, Dec 10 2005
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STATUS
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approved
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