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A033176
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Threes and ones.
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0
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31, 31331, 313313331, 31331333133331, 31331333133331333331, 313313331333313333313333331, 31331333133331333331333333133333331, 31331333133331333331333333133333331333333331
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| This sequence contains many primes.
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REFERENCES
| F. Smarandache, Properties of numbers, University of Craiova, 1973
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LINKS
| M. L. Perez et al., eds., Smarandache Notions Journal
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FORMULA
| a(n) has increasing groups of 31, 331, ..., 33...31 (n times 3) concatenated.
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CROSSREFS
| Sequence in context: A161395 A086122 A176349 * A188956 A117579 A107122
Adjacent sequences: A033173 A033174 A033175 * A033177 A033178 A033179
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KEYWORD
| nonn,easy,base,less
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AUTHOR
| Jan Jensen (dorul(AT)post6.tele.dk)
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EXTENSIONS
| More terms from Erich Friedman (erich.friedman(AT)stetson.edu).
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