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!)
 A090540 Beginning with 3, least prime obtained by sandwiching the previous term between strings of identical digits. 0
 3, 131, 11311, 771131177, 33337711311773333, 77777733337711311773333777777, 3777777333377113117733337777773, 33377777733337711311773333777777333, 333333337777773333771131177333377777733333333, 9933333333777777333377113117733337777773333333399, 33333993333333377777733337711311773333777777333333339933333 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Questions: (1) Is this sequence infinite? (2) If so, are the digits equally distributed? - Stefan Steinerberger, Nov 08 2005 LINKS CROSSREFS Sequence in context: A262639 A082563 A083999 * A262643 A048796 A213203 Adjacent sequences:  A090537 A090538 A090539 * A090541 A090542 A090543 KEYWORD base,nonn AUTHOR Amarnath Murthy, Dec 09 2003 EXTENSIONS a(6)-a(8) from Jim Nastos, Jan 30 2004 a(9)-a(11) from Stefan Steinerberger, Nov 08 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 22 22:22 EDT 2020. Contains 337962 sequences. (Running on oeis4.)