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Search: id:A081310
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| A081310 |
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Numbers having no representation as sum of a prime and an 3-smooth number. |
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+0
4
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| 1, 2, 36, 78, 96, 120, 126, 144, 156, 162, 186, 204, 210, 216, 222, 276, 288, 300, 306, 324, 328, 330, 336, 342, 366, 372, 378, 396, 408, 414, 426, 438, 456, 474, 486, 498, 516, 528, 534, 540, 546, 552, 562, 576, 582, 606, 612, 624, 630, 636, 666, 672, 690
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A081308(a(n))=0; complement of A081311.
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EXAMPLE
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For all primes p<36 the greatest prime factor of 36-p is >3: 36-2=2*17, 36-3=3*11, 36-5=31, 36-7=29, 36-11=5*5, 36-13=23, 36-17=19, 36-19=17, 36-23=13, 36-29=7, 36-31=5, therefore 36 is a term.
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CROSSREFS
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Cf. A000040, A003586.
Sequence in context: A096513 A037418 A058517 this_sequence A069067 A145450 A134785
Adjacent sequences: A081307 A081308 A081309 this_sequence A081311 A081312 A081313
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 17 2003
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