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A109686
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Smallest number beginning with the digits of n that has exactly n prime factors (counted with multiplicity).
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0
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11, 21, 30, 40, 500, 64, 704, 864, 9072, 1024, 11264, 120832, 133120, 143360, 1505280, 163840, 1720320, 18063360, 1966080, 20054016, 210567168, 22020096, 231211008, 243269632, 254803968, 2600468480, 2751463424, 28028436480, 2952790016, 30576476160, 31138512896, 32614907904, 330225942528
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(5)=500 since 500 has prime factorization 500=2*2*5*5*5 (5 factors) and begins with 5 and is the smallest such number
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CROSSREFS
| Sequence in context: A195100 A125164 A101223 * A077522 A049201 A068633
Adjacent sequences: A109683 A109684 A109685 * A109687 A109688 A109689
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KEYWORD
| base,nonn
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AUTHOR
| Erich Friedman (efriedma(AT)stetson.edu), Aug 07 2005
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EXTENSIONS
| a(24)-a(33) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Apr 27 2008
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