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Search: id:A055559
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| A055559 |
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Primes of form 2999...999. |
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+0
1
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| 29, 2999, 2999999, 29999999, 29999999999999999999, 2999999999999999999999999999, 29999999999999999999999999999999999999999999
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=3*10^n-1 and is prime
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EXAMPLE
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3*10^n-1 is prime for {1,3,6,7,19,27,43,55,207} n gives how many digit 9 occurs in these numbers
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CROSSREFS
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Cf. A051200.
Sequence in context: A084223 A138755 A091751 this_sequence A125074 A033519 A103656
Adjacent sequences: A055556 A055557 A055558 this_sequence A055560 A055561 A055562
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KEYWORD
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base,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jul 10 2000
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