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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
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
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
The value a(0)=1 was added by R. J. Mathar, May 31 2009
STATUS
approved

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Last modified March 28 17:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)