The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A107646 Primes from concatenating twin primes. 0
3557, 355711131719 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
3557 is a prime produced by concatenating twin primes (3,5) and (5,7).
355711131719 is a prime produced by concatenating twin primes (3,5), (5,7), (11,13) and (17,19).
MATHEMATICA
tw = Select[ Prime@ Range@100000, PrimeQ[ # + 2] &]; tw = Flatten /@ IntegerDigits@ Transpose[{tw, tw + 2}]; t = {}; Do[p = FromDigits@ Flatten@ Table[ tw[[i]], {i, n}]; If[ PrimeQ[p], Print[p]], {n, 1090}] (* Robert G. Wilson v *)
CROSSREFS
Sequence in context: A151810 A083955 A104207 * A204607 A204600 A204599
KEYWORD
hard,more,nonn,bref,base
AUTHOR
Parthasarathy Nambi, Jun 09 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 May 21 09:41 EDT 2024. Contains 372733 sequences. (Running on oeis4.)