login
This site is supported by donations to The OEIS Foundation.

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A097644 Numbers n such that pi(n)=reversal(n). 0
51, 130, 370, 8201, 73270, 82080, 26113610, 4854248220, 37682961610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This sequence has only two odd terms, i.e. 51 and 8201 and 10 divides all other terms. Next term is greater than 10^8.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

26113610 is in the sequence because

pi(26113610)=1631162=reversal(26113610).

MATHEMATICA

Do[If[PrimePi[m]==FromDigits[Reverse[IntegerDigits[m]]], Print[m]], {m, 100000000}]

CROSSREFS

Cf. A037171, A069215.

Sequence in context: A063314 A129298 A065010 * A044302 A044683 A044383

Adjacent sequences:  A097641 A097642 A097643 * A097645 A097646 A097647

KEYWORD

base,nonn

AUTHOR

Farideh Firoozbakht, Aug 25 2004

EXTENSIONS

Two more terms from Giovanni Resta, Feb 06 2006

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified April 19 17:29 EDT 2014. Contains 240767 sequences.