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A057951
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Number of prime factors of 10^n - 1 (counted with multiplicity).
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26
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2, 3, 4, 4, 4, 7, 4, 6, 6, 6, 4, 9, 5, 6, 8, 8, 4, 11, 3, 9, 9, 9, 3, 12, 7, 8, 9, 10, 7, 15, 5, 13, 8, 8, 9, 14, 5, 5, 8, 13, 6, 17, 6, 13, 12, 8, 4, 15, 6, 12, 10, 11, 6, 16, 10, 14, 8, 10, 4, 22, 9, 7, 16, 17, 9, 17, 5, 12, 8, 14, 4, 20, 5, 9, 14, 8, 10, 18
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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S. S. Wagstaff, Jr., Main Tables from the Cunningham Project.
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FORMULA
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MATHEMATICA
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PROG
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CROSSREFS
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Cf. A001222, A002283, A046053, A085035, A003020, A046107, A005422, A061075, A102380, A095370, A147556, A081317, A081318, A102347, A112505.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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