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4, 6, 9, 10, 14, 21, 22, 25, 26, 34, 38, 39, 45, 46, 49, 55, 57, 58, 62, 74, 82, 86, 93, 94, 99, 105, 106, 111, 118, 121, 122, 129, 134, 142, 146, 153, 155, 158, 165, 166, 169, 175, 178, 183, 194, 195, 201, 202, 203, 205, 206, 207, 214, 218, 219, 226, 231, 237
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Givens characterizes this sequence, see Theorem 5. In particular, this sequence is ({n: A215935(n) = 1} INTERSECT A005117) UNION (A060687 INTERSECT A051532). - Charles R Greathouse IV, Aug 27 2012
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LINKS
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Table of n, a(n) for n=1..58.
H. U. Besche, B. Eick and E. A. O'Brien, The Small Groups Library
Clint Givens, Orders for which there exist exactly two groups (2006)
Gordon Royle, Numbers of Small Groups
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CROSSREFS
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Cf. A000001, A003277, A054395, A054396, A054397, A055561, A135850.
Sequence in context: A115652 A193305 A084759 * A142863 A132435 A108631
Adjacent sequences: A054392 A054393 A054394 * A054396 A054397 A054398
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, May 21 2000
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EXTENSIONS
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More terms, formula from Christian G. Bower, May 25 2000
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STATUS
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approved
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