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Search: id:A047239
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| A047239 |
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Numbers that are congruent to {1, 2} mod 6. |
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+0
1
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| 1, 2, 7, 8, 13, 14, 19, 20, 25, 26, 31, 32, 37, 38, 43, 44, 49, 50, 55, 56, 61, 62, 67, 68, 73, 74, 79, 80, 85, 86, 91, 92, 97, 98, 103, 104, 109, 110, 115, 116, 121, 122, 127, 128, 133, 134, 139, 140, 145, 146, 151
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=3*(n-1)-(-1)^n [From Rolf Pleisch (r_pleisch(AT)gmx.ch), Aug 04 2009]
a(n)=6*n-a(n-1)-9 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 22 2009]
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EXAMPLE
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For n=2, a(2)=6*2-1-9=2; n=3, a(3)=6*3-2-9=7; n=4, a(4)=6*4-7-9=8 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 22 2009]
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CROSSREFS
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Sequence in context: A070044 A129850 A037073 this_sequence A032927 A004717 A063531
Adjacent sequences: A047236 A047237 A047238 this_sequence A047240 A047241 A047242
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KEYWORD
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nonn,new
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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