id:A039787 - OEIS Search Results

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Primes p such that p-1 is square-free.

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2, 3, 7, 11, 23, 31, 43, 47, 59, 67, 71, 79, 83, 103, 107, 131, 139, 167, 179, 191, 211, 223, 227, 239, 263, 283, 311, 331, 347, 359, 367, 383, 419, 431, 439, 443, 463, 467, 479, 499, 503, 547, 563, 571, 587, 599, 607, 619, 643, 647, 659, 683, 691, 719, 743 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`An equivalent definition: numbers n such that phi(n) is equal to the square-free kernel of n-1.`
	EXAMPLE	`phi(43)=42, 42=2^13^17^1, 237=42.` `p=223 is here because p-1=222=2337`
	CROSSREFS	`Cf. A000010, A007947.` `Sequence in context: A034795 A108184 A049091 this_sequence A129940 A128631 A092217` `Adjacent sequences: A039784 A039785 A039786 this_sequence A039788 A039789 A039790`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`
	EXTENSIONS	`More terms from Labos E. (labos(AT)ana.sote.hu)`

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

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