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Search: id:A030229
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| A030229 |
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Product of an even number of distinct primes. |
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+0
12
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| 1, 6, 10, 14, 15, 21, 22, 26, 33, 34, 35, 38, 39, 46, 51, 55, 57, 58, 62, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 177, 178, 183, 185, 187, 194, 201, 202, 203, 205, 206, 209, 210, 213, 214
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
Eric Weisstein's World of Mathematics, Moebius Function
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MAPLE
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a := n -> `if`(numtheory[mobius](n)=1, n, NULL); seq(a(i), i=1..214); [From Peter Luschny (peter(AT)luschny.de), May 04 2009]
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PROGRAM
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(PARI from M. F. Hasler):
isA030229(n)={ #(n=factor(n)[, 2]) % 2 == 0 && (!n || vecmax(n)==1 )}
for(n=1, 500, isA030229(n)&print1(n", "))
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CROSSREFS
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Cf. A006881, A151797.
Sequence in context: A120944 A052053 A006881 this_sequence A162730 A093772 A046400
Adjacent sequences: A030226 A030227 A030228 this_sequence A030230 A030231 A030232
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KEYWORD
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nonn,easy,nice
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net)
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