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Search: id:A072966
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| A072966 |
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Numbers which are not the sum of two semiprimes. |
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+0
7
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| 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 17, 22, 33
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Is this sequence finite?
See the graph of sequence A072931 for compelling evidence that 33 is the last term of this sequence. - T. D. Noe (noe(AT)sspectra.com), Apr 11 2007
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EXAMPLE
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a(10) = 11 since there is no way to represent 11 as a sum of two semiprimes. 13 is not a term since 13 = 4 + 9.
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CROSSREFS
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Cf. A001358.
Sequence in context: A030151 A131617 A005577 this_sequence A059759 A042952 A126327
Adjacent sequences: A072963 A072964 A072965 this_sequence A072967 A072968 A072969
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KEYWORD
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nonn,more
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AUTHOR
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Lior Manor (lior.manor(AT)gmail.com) Aug 13 2002
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