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Search: id:A033176
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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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COMMENT
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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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M. L. Perez et al., eds., Smarandache Notions Journal
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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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Sequence in context: A074218 A161395 A086122 this_sequence A117579 A107122 A059113
Adjacent sequences: A033173 A033174 A033175 this_sequence A033177 A033178 A033179
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KEYWORD
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nonn,easy
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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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More terms from Erich Friedman (erich.friedman(AT)stetson.edu).
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