id:A101932 - OEIS Search Results

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A101932

Numbers n with omega(n) equal to omega(n-1) and omega (n+1).

+0
6

3, 4, 8, 21, 34, 35, 39, 45, 51, 55, 56, 57, 75, 76, 86, 87, 92, 93, 94, 95, 99, 116, 117, 118, 123, 134, 135, 142, 143, 144, 145, 146, 147, 159, 160, 161, 176, 177, 184, 188, 201, 202, 206, 207, 208, 213, 214, 215, 216, 217, 218, 225 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`45 is in the sequence because it has 2 prime factors (3 and 5) as do 44 (2 and 11) and 46 (2 and 23).`
	MATHEMATICA	`For[i=1, i<1000, If[And[Length[FactorInteger[i-1]]==Length[FactorInteger[i]], Length[FactorInteger[i+1]]==Length[FactorInteger[i]]], Print[i]]; i++ ]`
	CROSSREFS	`Cf. A001221.` `Sequence in context: A107328 A129285 A051440 this_sequence A073313 A155701 A119529` `Adjacent sequences: A101929 A101930 A101931 this_sequence A101933 A101934 A101935`
	KEYWORD	`easy,nonn`
	AUTHOR	`N. Fernandez (primeness(AT)borve.org), Dec 21 2004`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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