

A091646


Number of primes less than 10^n having at least one digit 2.


9



1, 3, 29, 352, 3357, 32393, 312424, 3014171, 29016211, 279171099, 2685272908, 25829666453, 248507003625, 2391688694305
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..14.


EXAMPLE

a(2) = 3 because of the 25 primes less than 10^2, 3 have at least one digit 2.


CROSSREFS

a(n) + A091636(n) = A006880(n).
Cf. A091644, A091645, A091647, A091705, A091706, A091707, A091708, A091709, A091710.
Sequence in context: A001947 A323569 A049038 * A081506 A168127 A262640
Adjacent sequences: A091643 A091644 A091645 * A091647 A091648 A091649


KEYWORD

nonn,base


AUTHOR

Enoch Haga, Jan 30 2004


EXTENSIONS

Edited and extended by Robert G. Wilson v, Feb 02 2004
3 more terms from Ryan Propper, Aug 20 2005
a(13) from Robert Price, Nov 11 2013
a(14) from Giovanni Resta, Jul 21 2015


STATUS

approved



