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 A248207 Primitive root of the multiplicative group mod n as returned by PARI version 2.7.2, or 0 when there is no primitive root. 0
 1, 2, 3, 2, 5, 3, 0, 2, 7, 2, 0, 2, 3, 0, 0, 3, 11, 2, 0, 0, 13, 5, 0, 2, 15, 2, 0, 2, 0, 3, 0, 0, 3, 0, 0, 2, 21, 0, 0, 6, 0, 3, 0, 0, 5, 5, 0, 3, 27, 0, 0, 2, 29, 0, 0, 0, 31, 2, 0, 2, 3, 0, 0, 0, 0, 2, 0, 0, 0, 7, 0, 5, 39, 0, 0, 0, 0, 3, 0, 2, 47, 2, 0, 0, 3, 0, 0, 3, 0, 0, 0, 0, 5, 0, 0, 5, 3, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS PROG (PARI) a(n) = if(#znstar(n)[3]>1, 0, lift(znprimroot(n))); vector(99, n, a(n+1)) CROSSREFS Cf. A174621 (smallest primitive root, taking -1 for n with no primitive root). Cf. A046145 (smallest primitive root, taking 0 for n with no primitive root). Sequence in context: A132962 A046145 A103309 * A174621 A007967 A054494 Adjacent sequences:  A248204 A248205 A248206 * A248208 A248209 A248210 KEYWORD nonn AUTHOR Joerg Arndt, Jan 11 2015 STATUS approved

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Last modified February 22 12:42 EST 2020. Contains 332136 sequences. (Running on oeis4.)