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A141311
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Primes consisting of a digit and a nonempty string of 9's (i.e., primes of the form k*10^m - 1, where k is any digit).
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5
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19, 29, 59, 79, 89, 199, 499, 599, 1999, 2999, 4999, 8999, 49999, 59999, 79999, 199999, 599999, 799999, 2999999, 4999999, 19999999, 29999999, 59999999, 89999999, 799999999, 59999999999, 79999999999, 59999999999999, 499999999999999, 29999999999999999999
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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k can never be 1, 4, or 7, because if it were, k*10^m - 1 would be divisible by 3.
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LINKS
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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59999999 from Howard Berman (howard_berman(AT)hotmail.com), Apr 22 2009
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STATUS
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approved
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