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Search: id:A084424
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| A084424 |
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Odd numbers having odd numbers of prime factors, odd sums of prime factors and odd sums of decimal digits. |
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+0
1
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| 3, 5, 7, 23, 27, 29, 41, 43, 47, 61, 67, 83, 89, 113, 131, 137, 139, 151, 157, 173, 179, 191, 193, 195, 197, 199, 223, 227, 229, 241, 243, 263, 269, 281, 283, 285, 311, 313, 317, 331, 337, 353, 357, 359, 373, 379, 397, 399, 401, 409, 421, 429, 443, 449, 461
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A020639(a(n)), A001221(a(n)), A001222(a(n)), A008472(a(n)), A001414(a(n)) and A007953(a(n)) are all odd.
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EXAMPLE
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9675 is odd, 9675 = 3^2 * 5^2 * 43: omega=3, Omega=5, sopf=3+5+43=51, sopfr=3+3+5+5+43=59 and SumOfDigits=9+6+7+5=27, therefore 9675 is a term.
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CROSSREFS
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Sequence in context: A126144 A072002 A163637 this_sequence A137978 A155780 A119450
Adjacent sequences: A084421 A084422 A084423 this_sequence A084425 A084426 A084427
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KEYWORD
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nonn,base
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 27 2003
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