A189939 - OEIS

A189939

a(n) = n + [n*r/t] + [n*s/t]; r=1, s=sin(Pi/8), t=cos(Pi/8).

2, 4, 7, 9, 12, 14, 16, 19, 21, 24, 26, 28, 32, 34, 37, 39, 42, 44, 46, 49, 51, 54, 56, 58, 62, 64, 67, 69, 72, 74, 76, 79, 81, 84, 86, 88, 92, 94, 97, 99, 101, 104, 106, 109, 111, 114, 116, 118, 122, 124, 127, 129, 131, 134, 136, 139, 141, 144, 146, 148, 152, 154, 157, 159, 161, 164, 166, 169, 171, 173, 176, 178, 182, 184, 187, 189, 191

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OFFSET

1,1

COMMENTS

See A189937.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

FORMULA

A189937: a(n) = n + [n*sin(Pi/8)] + [n*cos(Pi/8)].

A189938: b(n) = n + [n*csc(Pi/8)] + [n*cot(Pi/8)].

A189939: c(n) = n + [n*sec(Pi/8)] + [n*tan(Pi/8)].

MATHEMATICA