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A176885
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Let p*q = A006881(n) be the n-th number that is the product of two distinct primes, with p = prime(i), q=prime(j); a(n) = p^j - q^i.
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1
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1, 3, 9, 2, 32, 21, 51, 122, 111, 282, 237, 560, 489, 1898, 1794, 6200, 995, 2017, 13428, 19154, 4059, 2166, 8151, 73212, 16341, 58208, 89088, 176186, 32721, 383766, 65483, 530072, 1940958, 131013, 740022, 262083, 1592642, 4781120, 5634480, 524221
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OFFSET
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1,2
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LINKS
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EXAMPLE
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For n=3, A006881(3) = 14 = 2*7, p=2, i=1, q=7, j=4; a(n) = 2^4-7^1 = 9.
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MAPLE
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(14) and a(15) corrected and sequence extended by R. J. Mathar, May 01 2010
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STATUS
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approved
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