id:A076137 - OEIS Search Results

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Numbers n such that Omega(n)=Omega(n-1)+ Omega(n-2)+ Omega(n-3), where Omega(n) denotes the number of prime factors of n, counting multiplicity.

+0
3

4, 32, 64, 96, 144, 180, 216, 224, 240, 360, 400, 432, 576, 600, 648, 672, 800, 972, 1008, 1040, 1088, 1104, 1188, 1232, 1260, 1344, 1400, 1404, 1408, 1456, 1500, 1584, 1620, 1624, 1680, 1700, 1764, 1800, 1840, 1880, 1904, 1920, 1980, 2000, 2040, 2064 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(3)=64 is a term because Omega(64)=6=Omega(63)+Omega(62)+Omega(61)=3+2+1=6`
	MATHEMATICA	`l = {4}; Do[If[Omega[n] == Omega[n - 1] + Omega[n - 2] + Omega[n - 3], l = Append[l, n]], {n, 5, 5000}]; l`
	CROSSREFS	`Cf. A076136, A001222.` `Sequence in context: A118901 A114076 A078092 this_sequence A138340 A113250 A012036` `Adjacent sequences: A076134 A076135 A076136 this_sequence A076138 A076139 A076140`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 30 2002`

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Last modified December 3 14:12 EST 2008. Contains 151279 sequences.

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