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A082180
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Composite integers n such that binomial(2*n,n) == 2 (mod n).
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0
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4, 9, 25, 49, 121, 125, 169, 289, 343, 361, 418, 529, 841, 961, 1331, 1369, 1681, 1849, 2197, 2209, 2809, 3481, 3721, 4489, 4913, 5041, 5329, 6241, 6859, 6889, 7921, 9409, 10201, 10609, 11449, 11881, 12167, 12769, 16129, 17161, 18769, 19321
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also, composite integers n such that A000108(n) == 2 (mod n).
It seems that sequence contains all odd prime squares and odd prime cubes. But there are other kind of numbers.
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CROSSREFS
| Cf. A000108.
Sequence in context: A182988 A158144 A158145 * A068999 A179707 A077438
Adjacent sequences: A082177 A082178 A082179 * A082181 A082182 A082183
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KEYWORD
| nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), May 10 2003
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EXTENSIONS
| More terms from John W. Layman (layman(AT)math.vt.edu), Jun 09 2004
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