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A067019
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Odd numbers with an odd number of prime factors (counted with multiplicity).
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17
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3, 5, 7, 11, 13, 17, 19, 23, 27, 29, 31, 37, 41, 43, 45, 47, 53, 59, 61, 63, 67, 71, 73, 75, 79, 83, 89, 97, 99, 101, 103, 105, 107, 109, 113, 117, 125, 127, 131, 137, 139, 147, 149, 151, 153, 157, 163, 165, 167, 171, 173, 175, 179, 181, 191, 193, 195, 197, 199
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OFFSET
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1,1
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COMMENTS
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The sequence a(1)=0, for n>1 a(n) is smallest number such that for all s,t,m<n a(n) != a(s)*a(t)+a(m) is the same as this one from a(3). - Anders Hellström, Jul 08 2015
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LINKS
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EXAMPLE
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a(9) = 27, which is odd with an odd number of prime factors, i.e., 3.
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PROG
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(PARI) { n=0; forstep (m=1, 10^10, 2, if (bigomega(m)%2 == 1, write("b067019.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Apr 25 2010
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CROSSREFS
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Cf. A353558 (characteristic function).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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