id:A064404 - OEIS Search Results

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When the numerator - denominator (A064169) in n-th harmonic number is prime.

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3, 4, 6, 7, 10, 19, 20, 26, 30, 31, 33, 40, 63, 85, 92, 100, 126, 131, 185, 196, 200, 204, 242, 246, 272, 274, 282, 379, 553, 572, 654, 777, 902, 1100, 1216, 1225, 1236, 1316, 1413, 1658, 1943, 2077, 2086 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`s = 1; Do[ m = n; s = s + 1/n; If[ PrimeQ[ Numerator[ s ] - Denominator[ s ] ], Print[ n ] ], {n, 2, 2500} ]`
	CROSSREFS	`Cf. A064169.` `Sequence in context: A026313 A024912 A108588 this_sequence A047514 A011975 A079249` `Adjacent sequences: A064401 A064402 A064403 this_sequence A064405 A064406 A064407`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 28 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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