A053427 - OEIS

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A053427

Catalan[n]-1 is prime.

4, 5, 6, 8, 9, 18, 25, 66, 87, 134, 145, 200, 384, 443, 502, 589, 625, 638, 1082, 1235, 1236, 1439, 1892, 2014, 2355, 2380, 2592, 2676, 2981, 3406, 3908, 4775, 5885 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Primality up to Catalan[5885]-1 proved by PrimeForm.`
	EXAMPLE	`Catalan[25]-1=50!/25!/26!-1=4861946401451 is prime.`
	CROSSREFS	`Cf. A000108, A053429.` `Sequence in context: A095279 A030751 A087947 * A037354 A206416 A144043` `Adjacent sequences: A053424 A053425 A053426 * A053428 A053429 A053430`
	KEYWORD	`nonn`
	AUTHOR	`David Broadhurst (D.Broadhurst(AT)open.ac.uk), Jan 10 2000`

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Last modified February 16 15:48 EST 2012. Contains 205930 sequences.