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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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1
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11, 20, 30, 420, 5460, 60060, 746130, 80059980, 900029130, 10407767370, 1100869379610, 12026713528830, 1300912477633230, 14299762385778870, 1502172599891453490, 160000041334479776430, 17000158733027932351890
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 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
| Cf. A077522.
Sequence in context: A038581 A044054 A044435 * A120442 A059407 A109376
Adjacent sequences: A011750 A011751 A011752 * A011754 A011755 A011756
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KEYWORD
| base,nonn
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AUTHOR
| Mark Hudson (mrmarkhudson(AT)hotmail.com), Feb 11 2003
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EXTENSIONS
| 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
a(11)-a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 03 2008
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