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A055629 Beginning of first run of at least n consecutive happy numbers. 3
1, 31, 1880, 7839, 44488, 7899999999999959999999996, 7899999999999959999999996 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
This sequence is infinite - see Theorem 3.1 of El-Sedy & Siksek.
LINKS
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.
EXAMPLE
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.
CROSSREFS
Cf. A007770.
Sequence in context: A049081 A069432 A338533 * A131751 A042863 A042860
KEYWORD
base,nonn
AUTHOR
David W. Wilson, Jun 05 2000
EXTENSIONS
The next term a(8) is too large to include.
Entry corrected by Sergio Pimentel, Dec 10 2005
STATUS
approved

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Last modified July 17 10:03 EDT 2024. Contains 374375 sequences. (Running on oeis4.)