id:A053858 - OEIS Search Results

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Even numbers n with an odd number of prime factors.

+0
4

30, 42, 66, 70, 78, 102, 110, 114, 130, 138, 154, 170, 174, 182, 186, 190, 222, 230, 238, 246, 258, 266, 282, 286, 290, 310, 318, 322, 354, 366, 370, 374, 402, 406, 410, 418, 426, 430, 434, 438, 442, 470, 474, 494, 498, 506, 518, 530, 534, 574, 582, 590 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`Even numbers n where mu(n) = -1`
	EXAMPLE	`a(3)=66 because 66 is even and prime divisors are 2, 3 and 11, an odd number.`
	MAPLE	`ts_m2_sod := proc(n); if (numtheory[mobius](n)=-1 and isprime(n)='false' and type(n, even)='true') then RETURN(n); fi end: am2sod := [seq(ts_m2_sod(i), i=1..2500)]: am2sod;`
	CROSSREFS	`A007304.` `Adjacent sequences: A053855 A053856 A053857 this_sequence A053859 A053860 A053861` `Sequence in context: A093599 A007304 A160350 this_sequence A075819 A034683 A087248`
	KEYWORD	`easy,nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Mar 28 2000`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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