login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145712 Number of primes p in the range 9 < p <= prime(10^n) that have most significant and least significant decimal digit both equal to 9. 3

%I #6 May 01 2013 21:11:53

%S 0,0,2,245,2053,17518,153645,1362970,12244431,111153241

%N Number of primes p in the range 9 < p <= prime(10^n) that have most significant and least significant decimal digit both equal to 9.

%e a(3)=2 because out of the first 1000 primes, only two have first and last digits 9, 919 and 929.

%Y Cf. A145709 A145710 A145711 A145713

%K hard,nonn,base

%O 1,3

%A _Enoch Haga_, Oct 16 2008

%E Better definition from R. J. Mathar, Aug 04 2010

%E Edited and corrected by _N. J. A. Sloane_, Aug 16 2010

%E a(7)-a(10) from _D. S. McNeil_, Aug 29 2010

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 28 21:55 EDT 2024. Contains 372095 sequences. (Running on oeis4.)