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Search: id:A056913
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A056913 Odd square-free numbers for which the number of prime divisors is even. +0
6
1, 15, 21, 33, 35, 39, 51, 55, 57, 65, 69, 77, 85, 87, 91, 93, 95, 111, 115, 119, 123, 129, 133, 141, 143, 145, 155, 159, 161, 177, 183, 185, 187, 201, 203, 205, 209, 213, 215, 217, 219, 221, 235, 237, 247, 249, 253, 259, 265, 267, 287, 291, 295, 299, 301, 303 (list; graph; listen)
OFFSET

1,2

COMMENT

Liouville function lambda(n) (A008836) is positive.

REFERENCES

H. Gupta, A formula for L(n), J. Indian Math. Soc., 7 (1943), 68-71.

CROSSREFS

Cf. A056911, A056912, A008836, A026424, A028260.

Sequence in context: A098905 A024556 A046388 this_sequence A002557 A128907 A020162

Adjacent sequences: A056910 A056911 A056912 this_sequence A056914 A056915 A056916

KEYWORD

easy,nonn

AUTHOR

James A. Sellers (sellersj(AT)math.psu.edu), Jul 07 2000

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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