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A176887
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Let A001358(n) = prime(m)*prime(k). Then a(n) = abs(prime(m)*k - prime(k)*m).
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0
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0, 1, 0, 1, 1, 1, 2, 1, 0, 1, 7, 3, 1, 3, 8, 5, 0, 13, 8, 14, 9, 9, 9, 19, 13, 9, 15, 16, 15, 28, 10, 29, 17, 17, 21, 38, 24, 25, 19, 0, 25, 43, 44, 20, 29, 49, 31, 1, 37, 31, 38, 35, 58, 29, 37, 0, 67, 41, 68, 51, 8, 47, 77, 49, 46, 58, 49, 7, 82, 51, 59, 47, 51, 83, 11, 53, 66, 92, 10
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OFFSET
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1,7
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COMMENTS
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The sequence is defined by considering first m<=k, adding the difference prime(m)*k-prime(k)*m to the sequence if >=0, then considering for the same semiprime m>=k, and adding the difference also to the sequence if >=0 and if different from the previous swapped case. - R. J. Mathar, May 06 2010
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LINKS
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EXAMPLE
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a(1)=0 because prime(1)*1-prime(1)*1=2-2=0; a(2)=1 because prime(1)*2-prime(2)*1=4-3=1.
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CROSSREFS
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KEYWORD
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nonn,less
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AUTHOR
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EXTENSIONS
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a(25), a(43), a(44) and maybe others corrected by R. J. Mathar, May 06 2010
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STATUS
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approved
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