id:A060084 - OEIS Search Results

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a(n) is the least prime not a primitive root of n-th prime.

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2, 3, 5, 2, 3, 3, 2, 5, 2, 5, 2, 3, 2, 2, 2, 7, 3, 3, 3, 2, 2, 2, 3, 2, 2, 5, 2, 3, 2, 2, 2, 3, 2, 5, 5, 2, 2, 5, 2, 13, 3, 3, 2, 2, 7, 2, 5, 2, 3, 2, 2, 2, 2, 2, 2, 2, 5, 2, 2, 2, 2, 17, 2, 2, 2, 7, 2, 2, 3, 3, 2, 2, 2, 3, 5, 2, 5, 2, 2, 2, 3, 3, 2, 2, 2, 3, 2, 2, 5, 2, 3, 2, 2, 3, 2, 2, 5, 2, 3, 3, 3, 7, 3, 2, 2, 2 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(8)=5 because 19 is the 8th prime, primes 2 and 3 are primitive roots of 19, but 5 is not.`
	MAPLE	`with(numtheory); for n from 1 to 100 do i := 1; while (i < n) and (primroot(ithprime(i) - 1, ithprime(n)) = ithprime(i)) do i := i+1; od; print( ithprime(i)); od:`
	CROSSREFS	`Cf. A000040, A060085.` `Sequence in context: A065996 A133906 A133907 this_sequence A138182 A102044 A125766` `Adjacent sequences: A060081 A060082 A060083 this_sequence A060085 A060086 A060087`
	KEYWORD	`easy,nonn`
	AUTHOR	`Marc LeBrun (mlb(AT)well.com), Feb 23 2001`
	EXTENSIONS	`Corrected by Jud McCranie (j.mccranie(AT)comcast.net), Mar 14 2001. Checked by N. J. A. Sloane (njas(AT)research.att.com) Sep 03 2002.`

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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