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Search: id:A007674
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| A007674 |
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Numbers n such that n and n+1 are square-free.
(Formerly M1322)
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+0
4
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| 1, 2, 5, 6, 10, 13, 14, 21, 22, 29, 30, 33, 34, 37, 38, 41, 42, 46, 57, 58, 61, 65, 66, 69, 70, 73, 77, 78, 82, 85, 86, 93, 94, 101, 102, 105, 106, 109, 110, 113, 114, 118, 122, 129, 130, 133, 137, 138, 141, 142, 145
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
P. R. Halmos, Problems for Mathematicians Young and Old. Math. Assoc. America, 1991, p. 28.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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CROSSREFS
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Sequence in context: A162340 A089269 A047440 this_sequence A086719 A115200 A075823
Adjacent sequences: A007671 A007672 A007673 this_sequence A007675 A007676 A007677
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
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Initial 1 added at suggestion of Zak Seidov, Sep 19 2007
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