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Search: id:A140784
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| A140784 |
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a(n) = least member of A006881 whose difference from the following one equals n, or 0 if no such semiprime exists. |
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+0
1
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| 14, 55, 35, 6, 46, 15, 26, 437, 146, 237, 95, 1082, 818, 597, 1603, 2705, 2078, 4511, 1418, 2681, 14545, 13863, 37551, 6559, 16053, 55805, 26707, 17965, 308918, 32777, 41222, 35103, 393565, 219509, 153263, 87627, 2263057, 35981, 1789339, 741841
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OFFSET
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1,1
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EXAMPLE
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If psd(j) = A006881(j), psd(1)=6 and psd(2)=10, hence a(4)=6; psd(3) =14 and psd(4)=15, hence a(1)=14
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CROSSREFS
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Cf. A001358, A006881, A131109.
Adjacent sequences: A140781 A140782 A140783 this_sequence A140785 A140786 A140787
Sequence in context: A048971 A006597 A114012 this_sequence A022285 A100157 A115129
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KEYWORD
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nonn
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AUTHOR
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Philippe Lallouet (philip.lallouet(AT)orange.fr), Jul 13 2008
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EXTENSIONS
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Edited by njas, Jul 20 2008
Corrected a(21), a(22), a(36), extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 23 2008
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