The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A068655 Primes which are a concatenation of at least two consecutive primes. 2
 23, 2357, 3137, 5711, 8389, 111317, 151157, 157163, 167173, 171923, 199211, 233239, 251257, 257263, 263269, 271277, 313741, 331337, 353359, 373379, 414347, 433439, 467479, 509521, 523541, 541547, 601607, 653659, 661673, 677683, 727733 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 111317 is a term as it is a concatenation of 11, 13 and 17. 199211 is a term as a concatenation of 199 and 211. MATHEMATICA Module[{pr=Prime[Range[500]], c2, c3, c4}, c2=Select[FromDigits/@ (Flatten[ IntegerDigits[ #], 1]&/@Partition[pr, 2, 1]), PrimeQ]; c3=Select[ FromDigits/@ (Flatten[IntegerDigits[#], 1]&/@Partition[pr, 3, 1]), PrimeQ]; c4= Select[ FromDigits/@(Flatten[IntegerDigits[#], 1]&/@Partition[ pr, 4, 1]), PrimeQ]; Take[Union[Join[c2, c3, c4]], 50]] (* Harvey P. Dale, Apr 20 2017 *) CROSSREFS Sequence in context: A220653 A281787 A132937 * A336170 A232362 A233226 Adjacent sequences:  A068652 A068653 A068654 * A068656 A068657 A068658 KEYWORD base,nonn AUTHOR Amarnath Murthy, Feb 28 2002 EXTENSIONS Edited by Larry Reeves (larryr(AT)acm.org), Oct 09 2003 STATUS approved

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

Last modified April 16 16:49 EDT 2021. Contains 343050 sequences. (Running on oeis4.)