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A183613
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a(n) = 3^^(n+1) modulo 10^n.
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9
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7, 87, 387, 5387, 95387, 195387, 4195387, 64195387, 464195387, 2464195387, 62464195387, 262464195387, 7262464195387, 27262464195387, 627262464195387, 5627262464195387, 75627262464195387, 575627262464195387, 4575627262464195387, 4575627262464195387
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OFFSET
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1,1
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COMMENTS
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For all m>n, 3^^m == 3^^(n+1) (mod 10^n). Hence, each term represents the tailing decimal digits of 3^^m for all sufficiently large m.
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REFERENCES
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M. Ripà, La strana coda della serie n^n^...^n, Trento, UNI Service, Nov 2011, p. 11-12, 69-78. ISBN 978-88-6178-789-6.
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LINKS
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FORMULA
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For n>1, a(n) = 3^a(n-1) mod 10^n.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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