The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A231788 Count of the first 10^n primes containing at least one 2's digit. 0

%I

%S 3,23,303,3503,44448,487900,5289359,57794031,658775109,7212208422,

%T 77028673251

%N Count of the first 10^n primes containing at least one 2's digit.

%F a(n) ~ 10^n. - _Charles R Greathouse IV_, May 21 2014

%e a(1)=3 because there are 3 primes not greater than 29 (the 10th prime) that contain a 2's digit. Namely: 2, 23, 29.

%t cnt = 0; Table[Do[p = Prime[k]; If[MemberQ[IntegerDigits[p], 2], cnt++], {k, 10^(n - 1) + 1, 10^n}]; cnt, {n, 5}] (* _T. D. Noe_, Nov 13 2013 *)

%Y Cf. A231726-A231790, A231792-A231796, A091634-A091643, A231412, A228413-A228421.

%K more,nonn,base

%O 1,1

%A _Robert Price_, Nov 13 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 3 04:21 EDT 2020. Contains 333195 sequences. (Running on oeis4.)