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 A031177 Unhappy numbers: numbers having period-8 2-digitized sequences. 21
 2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 27, 29, 30, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 83 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 Eric Weisstein's World of Mathematics, Digitaddition Eric Weisstein's World of Mathematics, Unhappy Number PROG (Haskell) a031177 n = a031177_list !! (n-1) a031177_list = filter ((/= 1) . a103369) [1..] -- Reinhard Zumkeller, Aug 24 2011 CROSSREFS Complement of happy numbers A007770. Cf. A056527. Cf. A003132, A103369. Sequence in context: A066022 A052047 A078831 * A164119 A308017 A184107 Adjacent sequences:  A031174 A031175 A031176 * A031178 A031179 A031180 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)