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Search: id:A075818
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| A075818 |
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Even numbers with exactly 3 prime factors (counted with multiplicity). |
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+0
1
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| 8, 12, 18, 20, 28, 30, 42, 44, 50, 52, 66, 68, 70, 76, 78, 92, 98, 102, 110, 114, 116, 124, 130, 138, 148, 154, 164, 170, 172, 174, 182, 186, 188, 190, 212, 222, 230, 236, 238, 242, 244, 246, 258, 266, 268, 282, 284, 286, 290, 292, 310, 316, 318, 322, 332, 338
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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28=2^2*7, 30=2*3*5 and 42=2*3*7 are even and are products of exactly 3 primes.
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MAPLE
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ts_bo3_sod := proc(n); if (numtheory[bigomega](n)=3 and type(n, even)='true') then RETURN(n); fi end: abo3sod := [seq(ts_bo3_sod(i), i=1..2300)]: abo3sod;
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CROSSREFS
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Cf. A046470, A053858.
Adjacent sequences: A075815 A075816 A075817 this_sequence A075819 A075820 A075821
Sequence in context: A046369 A066428 A054397 this_sequence A090738 A085103 A157940
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KEYWORD
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easy,nonn
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AUTHOR
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Jani Melik (jani_melik(AT)hotmail.com), Oct 13 2002
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EXTENSIONS
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Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 21 2002
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