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A239202 Multiplicative order of phi(n) modulo n when gcd(phi(n),n)=1. 1
1, 1, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 10, 6, 2, 2, 2, 2, 8, 2, 2, 2, 12, 2, 22, 2, 2, 15, 2, 2, 4, 28, 2, 12, 36, 2, 2, 2, 2, 2, 2, 44, 48, 20, 2, 2, 18, 2, 2, 46, 6, 28, 2, 2, 2, 52, 22, 2, 2, 2, 58, 2, 2, 18, 80, 2, 2, 2, 2, 45, 2, 70, 28, 6, 48, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

EXAMPLE

For n = 8: the 8th entry of A003277 is 15, and phi(15) = 8 has multiplicative order 4 modulo 15, so a(8) = 4.

MATHEMATICA

MultiplicativeOrder[EulerPhi[#], #] & /@ Select[Range[1000], GCD[#, EulerPhi[#]] == 1 &]

PROG

(PARI) lista(nn) = {for(n=1, nn, my(ephi = eulerphi(n)); if (gcd(ephi, n) == 1, print1(znorder(Mod(ephi, n)), ", ")); ); } \\ Michel Marcus, Feb 09 2015

CROSSREFS

Indexed by A003277.

Sequence in context: A332201 A060467 A125918 * A083533 A076500 A060594

Adjacent sequences:  A239199 A239200 A239201 * A239203 A239204 A239205

KEYWORD

nonn

AUTHOR

Alexander Gruber, Mar 12 2014

STATUS

approved

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Last modified June 3 05:29 EDT 2020. Contains 334798 sequences. (Running on oeis4.)