The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 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. 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 Adjacent sequences: A055626 A055627 A055628 * A055630 A055631 A055632 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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