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Search: id:A075333
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| A075333 |
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Pair up the natural numbers as (r, s) (say) so that all natural numbers are obtained only once as r, s, s+r, s-r or r*s: (2, 3), (4, 11), (8, 17), (10, 22), (13, 27), (16, 34), ... Sequence gives first member of each pair. |
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+0
5
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| 2, 4, 8, 10, 13, 16, 19, 21, 23, 28, 30, 33, 36, 38, 42, 43, 48, 52, 54, 55, 60, 63, 65, 69, 71, 75, 77, 80, 82, 84, 87, 92, 94, 96, 98, 102, 104, 107, 111, 113, 116, 119, 121, 124, 126, 128, 134, 137, 140, 142, 144, 148, 150, 153, 154, 159, 162, 166, 168, 172, 174
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The first pair starts with 2 and not with 1 as in (1,k) k occurs as 1*k (of the form r*s) and k (of the form s) itself, i.e. in two ways.
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LINKS
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Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Feb 24 2008, Table of n, a(n) for n = 1..151
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CROSSREFS
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Cf. A075334, A075335, A075336, A075337.
Sequence in context: A134533 A089953 A100278 this_sequence A014190 A141400 A030232
Adjacent sequences: A075330 A075331 A075332 this_sequence A075334 A075335 A075336
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 18 2002
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EXTENSIONS
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Corrected and extended by Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), Feb 24 2008
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