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!)
A036948 Smallest n-digit prime containing only the digits 6 and 7, or 0 if no such prime exists. 1
7, 67, 677, 0, 67777, 666667, 6676667, 66666667, 666666667, 6666666767, 66666666667, 666666676667, 6666666667777, 66666667677767, 666666666667777, 6666666666767777, 66666666666667667, 666666666666676667 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Table[SelectFirst[10#+7&/@FromDigits/@Tuples[{6, 7}, n], PrimeQ], {n, 0, 17}]/. (Missing["NotFound"]->0) (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 08 2019 *)
CROSSREFS
Sequence in context: A124291 A067275 A073552 * A020469 A340973 A199756
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Jan 04 1999
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 15 09:54 EDT 2024. Contains 372540 sequences. (Running on oeis4.)