id:A117283 - OEIS Search Results

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Numbers n for which the cototient n-phi(n) is a cube.

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1, 2, 3, 5, 7, 11, 12, 13, 14, 16, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 63, 67, 71, 73, 79, 81, 83, 89, 96, 97, 101, 103, 107, 109, 112, 113, 115, 124, 127, 128, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 187, 191, 193, 197, 199, 211, 223, 227 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`63 is in the sequence because 63-phi(63)=27, which is a cube`
	MATHEMATICA	`Select[Range[230], IntegerQ[(# - EulerPhi[ # ])^(1/3)] &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 24 2006`
	CROSSREFS	`Sequence in context: A104192 A104193 A117288 this_sequence A137923 A163753 A131930` `Adjacent sequences: A117280 A117281 A117282 this_sequence A117284 A117285 A117286`
	KEYWORD	`nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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