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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 * A195139 A010731 A048762

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 November 25 15:28 EST 2014. Contains 249997 sequences.