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A031176 Periods of sum of squares of digits iterated until the sequence becomes periodic. 17
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 April 16 18:53 EDT 2021. Contains 343050 sequences. (Running on oeis4.)