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A047220
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Numbers that are congruent to {0, 1, 3} mod 5.
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20
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0, 1, 3, 5, 6, 8, 10, 11, 13, 15, 16, 18, 20, 21, 23, 25, 26, 28, 30, 31, 33, 35, 36, 38, 40, 41, 43, 45, 46, 48, 50, 51, 53, 55, 56, 58, 60, 61, 63, 65, 66, 68, 70, 71, 73, 75, 76, 78, 80, 81, 83, 85, 86, 88, 90, 91, 93, 95, 96, 98, 100, 101, 103, 105, 106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(n)= floor(5(n-1)/3) [From Gary Detlefs (gdetlefs(AT)aol.com), Feb 20 2010]
a(n) = 2*n - floor(n/3) -(n^2 mod 3), with offset 0..a(0) = 0 [From Gary Detlefs (gdetlefs(AT)aol.com), Mar 19 2010]
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MAPLE
| seq(floor(5*(n-1)/3), n= 1..56); [From Gary Detlefs (gdetlefs(AT)aol.com), Feb 20 2010]
seq(2*n - floor(n/3) -(n^2 mod 3), n=0..55); [From Gary Detlefs (gdetlefs(AT)aol.com), Mar 19 2010]
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MATHEMATICA
| Table[Floor[5*(n-1)/3], {n, 100}] (* From Vladimir Joseph Stephan Orlovsky, Jan 28 2012 *)
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CROSSREFS
| A011655 [From Gary Detlefs (gdetlefs(AT)aol.com), Mar 19 2010]
Sequence in context: A189662 A186320 A188046 * A064994 A138235 A059541
Adjacent sequences: A047217 A047218 A047219 * A047221 A047222 A047223
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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