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A128054 Count, omitting numbers of the form 6k+4 and doubling multiples of 6. 3
0, 0, 1, 2, 3, 5, 6, 6, 7, 8, 9, 11, 12, 12, 13, 14, 15, 17, 18, 18, 19, 20, 21, 23, 24, 24, 25, 26, 27, 29, 30, 30, 31, 32, 33, 35, 36, 36, 37, 38, 39, 41, 42, 42, 43, 44, 45, 47, 48, 48, 49, 50, 51, 53, 54, 54, 55, 56, 57, 59, 60, 60, 61, 62, 63, 65, 66, 66 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..67.

FORMULA

a(n)=cos(2*pi*n/3)/6-sqrt(3)*sin(2*pi*n/3)/6+cos(pi*n/3)/2-sqrt(3)*sin(pi*n/3)/6+(3n-2)/3

CROSSREFS

Sequence in context: A165089 A165083 A165085 * A175081 A023834 A084735

Adjacent sequences:  A128051 A128052 A128053 * A128055 A128056 A128057

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Feb 13 2007

STATUS

approved

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Last modified May 24 04:20 EDT 2013. Contains 225613 sequences.