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 A031176 Periods of sum of squares of digits iterated until the sequence becomes periodic. 18
 1, 1, 8, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 1, 8, 8, 8, 8, 8, 1, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 1, 1, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 1, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 1, 8, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..99. Eric Weisstein's World of Mathematics, Digit addition. CROSSREFS Cf. A003132, A099645. [From R. J. Mathar, May 31 2009] Sequence in context: A010531 A195141 A171811 * A269350 A195139 A010731 Adjacent sequences: A031173 A031174 A031175 * A031177 A031178 A031179 KEYWORD nonn,base AUTHOR Eric W. Weisstein EXTENSIONS The value a(0)=1 was added by R. J. Mathar, May 31 2009 STATUS approved

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Last modified June 17 15:57 EDT 2024. Contains 373463 sequences. (Running on oeis4.)