login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A056619 Smallest prime with primitive root of n or 0 if no such prime exists. 1
2, 3, 2, 0, 2, 11, 2, 3, 0, 7, 2, 5, 2, 3, 2, 0, 2, 5, 2, 3, 2, 5, 2, 7, 0, 3, 2, 5, 2, 11, 2, 3, 2, 19, 2, 0, 2, 3, 2, 7, 2, 5, 2, 3, 2, 11, 2, 5, 0, 3, 2, 5, 2, 7, 2, 3, 2, 5, 2, 19, 2, 3, 2, 0, 2, 7, 2, 3, 2, 19, 2, 5, 2, 3, 2, 13, 2, 5, 2, 3, 0, 5, 2, 11, 2, 3, 2, 5, 2, 11, 2, 3, 2, 7, 2, 7, 2, 3, 2 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

a(n) = 0 only for perfect squares, A000290.

CROSSREFS

Here the primitive root may be larger than the prime, whereas in A023049 in may not be.

Cf. A001122, A001913, A019334-A019421.

Sequence in context: A021435 A007325 A187038 * A165192 A104771 A056888

Adjacent sequences:  A056616 A056617 A056618 * A056620 A056621 A056622

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 07 2000

EXTENSIONS

Corrected and extended by Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Mar 21, 2002.

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 19:39 EST 2012. Contains 205945 sequences.