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Search: id:A055629
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| A055629 |
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Beginning of first run of n consecutive happy numbers. |
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+0
1
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| 1, 31, 1880, 7839, 44488, 7899999999999959999999996, 7899999999999959999999996
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is infinite - see the reference.
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REFERENCES
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El-Sedy, Esam and Siksek, Samir, On happy numbers, Rocky Mountain J. Math. 30 (2000), 565-570.
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LINKS
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Hao Pan, On consecutive happy numbers, J. Numb. Theory 128 (6) (2008) 1646-1654. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 28 2008]
J. H. Smith, Happy Numbers.
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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: A130661 A049081 A069432 this_sequence A131751 A042863 A042860
Adjacent sequences: A055626 A055627 A055628 this_sequence 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 (davidwwilson(AT)comcast.net), 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 (ferdiego(AT)cox.net), Dec 10 2005
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