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Search: id:A047219
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| A047219 |
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Numbers that are congruent to {1, 3} mod 5. |
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+0
7
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| 1, 3, 6, 8, 11, 13, 16, 18, 21, 23, 26, 28, 31, 33, 36, 38, 41, 43, 46, 48, 51, 53, 56, 58, 61, 63, 66, 68, 71, 73, 76, 78, 81, 83, 86, 88, 91, 93, 96, 98, 101, 103, 106, 108, 111, 113, 116, 118, 121, 123, 126, 128
(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)=Floor[(5n+2)/2]. - Santi Spadaro (spados(AT)katamail.com), Jul 24 2001
Row sums of triangle A131900 - Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 25 2007
a(n)=5*n-a(n-1)-6 (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)=5*2-1-6=3; n=3, a(3)=5*3-3-6=6; n=4, a(4)=5*4-6-6=8 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 22 2009]
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CROSSREFS
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Cf. A000566.
Cf. A131900.
Sequence in context: A013642 A140482 A118011 this_sequence A139477 A122437 A090848
Adjacent sequences: A047216 A047217 A047218 this_sequence A047220 A047221 A047222
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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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