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A132221 Number of imprimitive transitive groups of order n. +0
1
0, 0, 0, 3, 0, 12, 0, 43, 23, 36, 0, 295, 0, 59, 98, 1932, 0, 979, 0, 1113, 155, 55, 0, 24995, 183, 89, 2377, 1840, 0, 5708, 0 (list; graph; listen)
OFFSET

1,4

COMMENT

Smallest order of an imprimitive group is 4. The groups of order 4 are C_4, V_4, D_4.

Imprimitive groups do not exist with prime orders.

FORMULA

A002106[n]-A000019[n]

CROSSREFS

Cf. A000019, A002106.

Sequence in context: A094897 A019264 A028851 this_sequence A140093 A055314 A110890

Adjacent sequences: A132218 A132219 A132220 this_sequence A132222 A132223 A132224

KEYWORD

nonn

AUTHOR

Artur Jasinski (grafix(AT)csl.pl), Aug 14 2007

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.


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