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!)
A102497 Primes of the concatenated form 1nn1 where n is an integer >=0. 3
112121, 113131, 115151, 119191, 127271, 131311, 134341, 136361, 140401, 142421, 145451, 149491, 157571, 158581, 161611, 169691, 170701, 172721, 178781, 182821, 187871, 190901, 191911, 196961, 197971, 1100010001, 1100210021, 1101710171 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
112121 is prime and is of the form 1nn1 for n=12.
1100010001 is prime and is of the form 1nn1 for n=1000.
CROSSREFS
Cf. A100846; A100496 for the values of n that produce these primes.
Sequence in context: A210131 A111332 A151841 * A215566 A206071 A250526
KEYWORD
easy,nonn,base
AUTHOR
Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 12 2005
STATUS
approved

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 March 1 13:16 EST 2024. Contains 370433 sequences. (Running on oeis4.)