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Search: id:A011753
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| A011753 |
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Smallest number beginning with n and having n different prime divisors (which may be repeated). |
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+0
2
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| 11, 20, 30, 420, 5460, 60060, 746130, 80059980, 900029130, 10407767370
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1)=11 because it begins with 1 and has one prime divisor. a(5)=5460=2^2*3*5*7*13 has 5 distinct prime divisors.
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CROSSREFS
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Cf. A077522.
Sequence in context: A038581 A044054 A044435 this_sequence A120442 A059407 A109376
Adjacent sequences: A011750 A011751 A011752 this_sequence A011754 A011755 A011756
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KEYWORD
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base,more,nonn
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AUTHOR
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Mark Hudson (mrmarkhudson(AT)hotmail.com), Feb 11 2003
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EXTENSIONS
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More terms from Erich Friedman (efriedma(AT)stetson.edu), Aug 08 2005
a(11) was incorrect. Franklin T. Adams-Watters found a smaller candidate, 1102786855170, and asks if this is the true value of a(11). Dec 07 2006
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