id:A111159 - OEIS Search Results

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Numbers n such that A111075(n) is odd.

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1, 3, 4, 6, 12, 16, 24, 25, 27, 48, 49, 54, 64, 75, 96, 100, 108, 121, 147, 150, 169, 192, 196, 216, 243, 256, 289, 294, 300, 361, 363, 384, 400, 432, 484, 486, 507, 529, 588, 600, 625, 675, 676, 726, 768, 784, 841, 864, 867, 961, 972, 1014, 1024 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Conjecture: A111075(n) is odd whenever: (i) n = m^2 for all m>=1 such that 3 does not divide m, or (ii) n = 3*A028982(m) for all m>=1. Also, A028982 gives "Union of nonzero squares and twice squares."` `It is not difficult to show that the conjecture is true. - Max Alekseyev (maxale(AT)gmail.com), Oct 12 2005`
	CROSSREFS	`Sequence in context: A044843 A024373 A015888 this_sequence A109069 A124571 A095765` `Adjacent sequences: A111156 A111157 A111158 this_sequence A111160 A111161 A111162`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Oct 12 2005`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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