A119641 - OEIS

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A119641

Prime numbers of trees with n unlabeled nodes.

2, 3, 11, 23, 47, 1301, 7741, 83453838443384019701, 3497830604170469202903845457503189, 3043448204076362393100321053325760617159315927820231750001 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,1`
	COMMENTS	`A000055(n) is prime for n = 4, 5, 7, 8, 9, 13, 15, 52, 82, 134, 216, 341, 538, ...` `A000055(n) is semiprime for n = 6, 10, 11, 12, 17, 23, 32, 41, 56, 72, no more through 100 Jonathan Vos Post, Feb 8, 2011].`
	LINKS	`Table of n, a(n) for n=0..9.`
	FORMULA	`A000040 INTERSECTION A000055.`
	CROSSREFS	`Cf. A000055.` `Sequence in context: A091310 A040994 A141123 * A074496 A065849 A136402` `Adjacent sequences: A119638 A119639 A119640 * A119642 A119643 A119644`
	KEYWORD	`nonn`
	AUTHOR	`Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Jul 27 2006`
	STATUS	`approved`

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Last modified May 18 12:20 EDT 2013. Contains 225419 sequences.