id:A072357 - OEIS Search Results

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Cube-free non-squares having exactly one square in their factorization.

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12, 18, 20, 28, 44, 45, 50, 52, 60, 63, 68, 75, 76, 84, 90, 92, 98, 99, 116, 117, 124, 126, 132, 140, 147, 148, 150, 153, 156, 164, 171, 172, 175, 188, 198, 204, 207, 212, 220, 228, 234, 236, 242, 244, 245, 260, 261, 268, 275, 276, 279, 284, 292, 294, 306, 308 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`n such that A001222(n) - A001221(n) = 1 and A001221(n)>1.`
	EXAMPLE	`a(14) = 84 = 732^2; the following numbers are not terms: 36=6^2, as it is a square; 54=23^3, as it is not cube-free; 42=237, as there is no prime square; 72=26^2, as 72 has two prime square divisors: 2^2 and 3^2.`
	CROSSREFS	`Cf. A054753, A060687, A067259, A004709.` `Sequence in context: A070011 A084679 A072588 this_sequence A054753 A098899 A098770` `Adjacent sequences: A072354 A072355 A072356 this_sequence A072358 A072359 A072360`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 18 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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