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Search: id:A081329
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| A081329 |
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Numbers having no representation as sum of two 3-smooth numbers. |
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+0
6
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| 1, 23, 46, 47, 53, 61, 69, 71, 77, 79, 92, 94, 95, 101, 103, 106, 107, 115, 119, 121, 122, 125, 127, 133, 138, 139, 141, 142, 143, 149, 151, 154, 157, 158, 159, 161, 167, 169, 173, 175, 179, 181, 183, 184, 185, 187, 188, 190, 191, 197, 199, 202, 203, 205, 206
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OFFSET
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1,2
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COMMENT
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A081326(a(n))=0; complement of A081330.
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EXAMPLE
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For all 3-smooth numbers m<23 the greatest prime factor of 23-m is >3: 23-1=2*11, 23-2=3*7, 23-3=4*5, 23-2^2=19, 23-2*3=17, 23-2^3=3*5, 23-3^2=2*7, 23-3*2^2=11, 23-2^4=7, 23-2*3^2=5, therefore 23 is a term.
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CROSSREFS
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Cf. A003586.
Sequence in context: A030656 A122041 A040506 this_sequence A025022 A094694 A164010
Adjacent sequences: A081326 A081327 A081328 this_sequence A081330 A081331 A081332
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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 19 2003
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