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A136641
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a(n) = smallest positive integer that is coprime to n and has n positive divisors.
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0
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1, 3, 4, 15, 16, 175, 64, 105, 100, 567, 1024, 1925, 4096, 3645, 784, 945, 65536, 13475, 262144, 6237, 1600, 295245, 4194304, 25025, 1296, 2657205, 4900, 40095, 268435456, 3776773, 1073741824, 10395, 25600, 215233605, 5184, 175175
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| The sequence of positive integers each with 9 divisors starts: 36, 100, 196, 225, 256,... Now 36 is not coprime to 9. But 100, the next bigger value with 9 divisors, is. So a(9) = 100.
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CROSSREFS
| Cf. A073904.
Sequence in context: A066830 A192211 A083061 * A053359 A056742 A041435
Adjacent sequences: A136638 A136639 A136640 * A136642 A136643 A136644
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KEYWORD
| nonn
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AUTHOR
| Leroy Quet Apr 14 2008
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EXTENSIONS
| More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), May 03 2010
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