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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
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OFFSET
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1,1
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COMMENTS
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This sequence contains many primes.
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REFERENCES
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F. Smarandache, Properties of numbers, University of Craiova, 1973
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LINKS
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FORMULA
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a(n) has increasing groups of 31, 331, ..., 33...31 (n times 3) concatenated.
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CROSSREFS
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KEYWORD
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nonn,easy,base,less
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AUTHOR
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Jan Jensen (dorul(AT)post6.tele.dk)
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EXTENSIONS
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STATUS
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approved
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