id:A082180 - OEIS Search Results

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Numbers n, not primes, such that c(n)==2 (mod n) where c(n) denotes the n-th Catalan number = 1/(n+1)*C(2n,n).

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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; listen)

	OFFSET	`1,1`
	COMMENT	`It seems that sequence contains all odd prime squares and odd prime cubes. But there are other kind of numbers.`
	CROSSREFS	`Cf. A000108.` `Sequence in context: A053704 A158144 A158145 this_sequence A068999 A077438 A001248` `Adjacent sequences: A082177 A082178 A082179 this_sequence A082181 A082182 A082183`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 10 2003`
	EXTENSIONS	`More terms from John W. Layman (layman(AT)math.vt.edu), Jun 09 2004`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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