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Search: id:A091646
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| A091646 |
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Number of primes less than 10^n having at least one digit 2. |
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+0
3
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| 1, 3, 29, 352, 3357, 32393, 312424, 3014171, 29016211, 279171099, 2685272908, 25829666453
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2) = 3 because of the 25 primes less than 10^2, 3 have at least one digit 2.
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CROSSREFS
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a(n) + A091636(n) = A006880(n).
Cf. A091744, A091745, A091747, A091705, A091706, A091707, A091708, A091709, A091710.
Sequence in context: A112711 A001947 A049038 this_sequence A081506 A113871 A092251
Adjacent sequences: A091643 A091644 A091645 this_sequence A091647 A091648 A091649
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KEYWORD
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nonn,base
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Jan 30 2004
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 02 2004
3 more terms from Ryan Propper (rpropper(AT)stanford.edu), Aug 20 2005
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