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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A003684 Number of n-digit reversible primes (or emirps) with distinct digits. 11
4, 8, 22, 84, 402, 1218, 3572, 8218, 11804 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

13, 17, 31, 37, 71, 73, 79 and 97 are reversible primes (emirps), so a(2)=8.

CROSSREFS

Cf. A006567, A007628, A046732, A048051, A048052, A048053, A048054, A048895.

Sequence in context: A057583 A129788 A170938 * A075688 A026596 A181688

Adjacent sequences:  A003681 A003682 A003683 * A003685 A003686 A003687

KEYWORD

nonn,fini,full,base,easy,nice

AUTHOR

Harvey P. Dale (hpd(AT)apscompany.com) and Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)

EXTENSIONS

Typo in example corrected by David Ritterskamp (dritters(AT)usi.edu), Mar 24 2008

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

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

Last modified February 17 04:58 EST 2012. Contains 205985 sequences.