A091646 Number of primes less than 10^n having at least one digit 2.

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

Offset: 1

Author

Enoch Haga, Jan 30 2004

Keywords

• nonn
• base

Examples

			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.

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