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Search: id:A163813
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| A163813 |
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Start with A000961 = prime powers p^k (p prime, k >= 0): 1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 19, 23, 25. Then for each m >= 1 swap the m-th prime (k=1) with the m-th composite prime power (k>1). |
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+0
2
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| 1, 4, 8, 2, 9, 16, 3, 5, 25, 27, 7, 32
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This is a permutation of A000961.
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EXAMPLE
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First prime, 2, is swapped with first prime power, 4.
Second prime, 3, is swapped with 2nd prime power, 8.
Third prime, 5, is swapped with 3rd prime power, 9.
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CROSSREFS
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Cf. A163814, A000961.
Cf. A000040, A008578, A025475 [From Omar E. Pol (info(AT)polprimos.com), Aug 14 2009]
Sequence in context: A133058 A011516 A088609 this_sequence A109815 A110653 A052309
Adjacent sequences: A163810 A163811 A163812 this_sequence A163814 A163815 A163816
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KEYWORD
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nonn,more
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Aug 04 2009
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EXTENSIONS
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Edited by N. J. A. Sloane, Aug 10 2009, based on email from Zak Seidov
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