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A025476 Prime root of n-th nontrivial prime power (A025475). +0
2
2, 2, 3, 2, 5, 3, 2, 7, 2, 3, 11, 5, 2, 13, 3, 2, 17, 7, 19, 2, 23, 5, 3, 29, 31, 2, 11, 37, 41, 43, 2, 3, 13, 47, 7, 53, 5, 59, 61, 2, 67, 17, 71, 73, 79, 3, 19, 83, 89, 2, 97, 101, 103, 107, 109, 23, 113, 11, 5, 127, 2, 7, 131, 137, 139, 3, 149, 151, 29, 157, 163, 167, 13, 31, 173, 179 (list; graph; listen)
OFFSET

1,1

MATHEMATICA

Transpose[ Flatten[ FactorInteger[ Select[ Range[2, 30000], !PrimeQ[ # ] && Mod[ #, # - EulerPhi[ # ]] == 0 &]], 1]][[1]] (from Robert G. Wilson v)

CROSSREFS

Sequence in context: A157987 A025478 A084371 this_sequence A078773 A151663 A162753

Adjacent sequences: A025473 A025474 A025475 this_sequence A025477 A025478 A025479

KEYWORD

easy,nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


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