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 A094406 Smallest unhappy number that takes n steps to reach any of the unhappy cycle (4, 16, 37, 58, 89, 145, 42, 20) under iteration of sum of squares of digits map. 2
 4, 2, 11, 15, 5, 3, 14, 45, 36, 6, 112, 269, 15999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS This sequence is an analog of sequence A001273 with the unhappy numbers instead of the happy numbers. LINKS W. Schneider, Unhappy Numbers. EXAMPLE 15 is the fourth term because: 15: 1^2 + 5^2 = 26 / 26: 2^2 + 6^2 = 40 / 40: 4^2 + 0^2 = 16 and 16 is a member of the unhappy number series (4, 16, 37, 58, 89, 145, 42, 20) CROSSREFS Cf. A001273. Sequence in context: A213568 A185878 A182870 * A142706 A092952 A286145 Adjacent sequences:  A094403 A094404 A094405 * A094407 A094408 A094409 KEYWORD nonn,base AUTHOR Sergio Pimentel, Apr 30 2004 EXTENSIONS The next term, 577999999999....999999999999 (199 digits) is too large to include. Edited by Charles R Greathouse IV, Aug 03 2010 STATUS approved

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