id:A103634 - OEIS Search Results

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a(1) = 0; a(n) = the least k such that ((n+1)(n+2)(n+3)...(n+k))/((n-1)(n-2)(n-3)...(n-k)) is an integer (see A092935).

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0, 1, 1, 2, 3, 4, 3, 6, 7, 8, 9, 10, 9, 12, 13, 12, 15, 16, 15, 18, 17, 20, 21, 22, 23, 24, 25, 26, 25, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 39, 42, 43, 42, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 63, 66, 67, 68, 69, 70, 71 (list; graph; listen)

	OFFSET	`1,4`
	PROGRAM	`(PARI) { a(n) = local(p, q, r); p=1; q=1; for(k=1, n, p=n+k; q=n-k; r=gcd(p, q); p\=r; q\=r; if(q==1, return(k))) }`
	CROSSREFS	`Cf. A092935.` `Sequence in context: A076618 A116550 A116991 this_sequence A098596 A058267 A048259` `Adjacent sequences: A103631 A103632 A103633 this_sequence A103635 A103636 A103637`
	KEYWORD	`nonn`
	AUTHOR	`Max Alekseyev (maxal(AT)cs.ucsd.edu), Feb 11 2005`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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