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A072165 Values of Moebius function of the products of two (not necessarily distinct) primes (semiprimes or 2-almost primes, A001358). 0
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; refs; listen; history; internal format)
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

Sequence in context: A030308 A112690 A115971 * A072608 A171386 A125720

Adjacent sequences:  A072162 A072163 A072164 * A072166 A072167 A072168

KEYWORD

easy,nonn

AUTHOR

Jani Melik (jani_melik(AT)hotmail.com), Jun 28 2002

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.