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Search: id:A144569
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| A144569 |
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Composites with smallest prime factor^largest prime factor > largest prime factor^smallest prime factor. |
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+0
1
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| 10, 14, 15, 20, 21, 22, 26, 28, 30, 33, 34, 35, 38, 39, 40, 42, 44, 45, 46, 50, 51, 52, 55, 56, 57, 56, 60, 62, 63, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 82, 84, 85, 86, 87, 88, 90
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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If 10(composite)=2*5 where 2^5=32>25=5^2, then 10=a(1). If 14(composite)=2*7 where 2^7=128>49=7^2, then 14=a(2). If 15(composite)=3*5 where 3^5=243>125=5^3, then 15=a(3). If 20(composite)=2*2*5 where 2^5=32>25=5^2, then 20=a(4), etc.
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CROSSREFS
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Cf. A002808.
Sequence in context: A164936 A102361 A121836 this_sequence A081062 A119613 A154371
Adjacent sequences: A144566 A144567 A144568 this_sequence A144570 A144571 A144572
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 04 2009
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