id:A120947 - OEIS Search Results

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A120947

a(n) = smallest m such that n-th prime divides Pell(m).

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2, 4, 3, 6, 12, 7, 8, 20, 22, 5, 30, 19, 10, 44, 46, 27, 20, 31, 68, 70, 36, 26, 84, 44, 48, 51, 34, 108, 55, 28, 126, 132, 17, 140, 75, 150, 79, 164, 166, 87, 36, 91, 190, 96, 9, 18, 212, 74, 76, 23, 116, 14, 40, 84, 64, 262, 15, 270, 139, 140, 284, 49, 308, 310, 78, 159, 332 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For all divisors d of n>0, Pell(d) divides Pell(n), so if a prime divides the n-th Pell number, so does it for all multiples of n.`
	EXAMPLE	`a(4)=6 because the 6th Pell number, 70, is the first that is divisible by the 4th prime (=7).`
	CROSSREFS	`Cf. A000129 (Pell numbers), A001602 (equivalent sequence with Fibonacci numbers).` `Sequence in context: A002326 A064273 A134561 this_sequence A046793 A101278 A091274` `Adjacent sequences: A120944 A120945 A120946 this_sequence A120948 A120949 A120950`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Aug 19 2006`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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