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Search: id:A064040
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| A064040 |
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Number of distinct prime divisors of n is a prime. |
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+0
3
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| 6, 10, 12, 14, 15, 18, 20, 21, 22, 24, 26, 28, 30, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Below 210 this sequence and A024619 are identical.
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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210 = 2*3*5*7 has 4 prime factors, hence it is not here, but it is part of A024619.
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PROGRAM
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(PARI) { n=0; for (m=1, 10^9, if (isprime(omega(m)), write("b064040.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 06 2009]
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CROSSREFS
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Cf. A064041, A024619, A000977, A033992, A007774, A033993, A051270, A063989..
Sequence in context: A133210 A141467 A105642 this_sequence A024619 A106543 A007774
Adjacent sequences: A064037 A064038 A064039 this_sequence A064041 A064042 A064043
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KEYWORD
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nonn,easy
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AUTHOR
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Lior Manor (lior.manor(AT)gmail.com) Aug 23 2001
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