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A064400 Number of ordered pairs a,b of elements in the dihedral group D_2n such that the subgroup generated by the pair a,b is the entire group D_2n. 1
3, 6, 18, 24, 60, 36, 126, 96, 162, 120, 330, 144 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = 3 * A002618(n) = 3 * n * phi(n)

CROSSREFS

A002618, A064279.

Sequence in context: A074370 A174101 A088339 * A117863 A103100 A101726

Adjacent sequences:  A064397 A064398 A064399 * A064401 A064402 A064403

KEYWORD

nonn

AUTHOR

Dan Fux (dan.fux(AT)OpenGaia.com or danfux(AT)OpenGaia.com), Sep 28 2001

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Last modified February 17 15:57 EST 2012. Contains 206050 sequences.