id:A050530 - OEIS Search Results

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n - EulerPhi[n] is prime.

+0
9

4, 9, 15, 25, 33, 35, 49, 51, 65, 77, 87, 91, 95, 119, 121, 123, 143, 161, 169, 177, 185, 209, 213, 215, 217, 221, 247, 255, 259, 287, 289, 303, 321, 329, 335, 341, 361, 371, 377, 395, 403, 407, 411, 427, 435, 437, 447, 455, 469, 473, 485, 511, 515, 527, 529 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`A051953(n) is prime`
	EXAMPLE	`1. If n=p^2 is square of a prime, then p^2 - Phi[p^2] = p, so this sequence is infinite and generates all primes 2. No p prime belongs here because A051953(p)=1 3. Other cases exist, e.g. n-Phi[n]=23 if n=95,119,143,529`
	CROSSREFS	`Cf. A051953, A005278.` `Sequence in context: A052116 A109641 A134675 this_sequence A102084 A107993 A030664` `Adjacent sequences: A050527 A050528 A050529 this_sequence A050531 A050532 A050533`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 29 1999`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.

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