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Search: id:A144567
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| A144567 |
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Primes of the form : smallest prime factor of composite(n) + largest prime factor of composite(n). |
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+0
1
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| 5, 7, 5, 5, 7, 13, 5, 7, 19, 5, 7, 13, 5, 7, 5, 31, 7, 13, 19, 7, 43, 13, 7, 5, 7, 19, 5, 13, 31, 61, 7, 13, 19, 73, 5, 7, 13, 7, 5, 43, 19, 31, 13, 7, 5, 13, 7, 103, 19
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OFFSET
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1,1
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EXAMPLE
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If n=2, 6(composite)=2*3 and 2+3=5(prime), then 5=a(1). If n=5, 10(composite)=2*5 and 2+5=7(prime), then 7=a(2). If n=6, 12(composite)=2*2*3 and 2+3=5(prime), then 5=a(3), etc.
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CROSSREFS
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Cf. A000040, A002808, A119689.
Sequence in context: A122271 A011205 A167133 this_sequence A010718 A090987 A065746
Adjacent sequences: A144564 A144565 A144566 this_sequence A144568 A144569 A144570
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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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