id:A072165 - OEIS Search Results

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Values of Moebius function of the products of two (not necessarily distinct) primes (semiprimes or 2-almost primes, A001358).

+0
1

0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Kimberly Schneider, Moebius function.`
	MAPLE	`semiprimes := proc(d_n) local a, i; a := [ ]; for i from 1 to d_n do if((tau(i) = 3) or ((mobius(i) <> 0) and (tau(i) = 4))) then a := [ op(a), mobius(i) ]; fi; od: RETURN(a); end;`
	CROSSREFS	`Adjacent sequences: A072162 A072163 A072164 this_sequence A072166 A072167 A072168` `Sequence in context: A023532 A112690 A115971 this_sequence A072608 A125720 A095130`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jani Melik (jani_melik(AT)hotmail.com), Jun 28 2002`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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