A189681 - OEIS

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A189681

(A189676)/2; from a 3-way partition of the positive integers.

2, 4, 7, 9, 12, 14, 17, 19, 21, 24, 26, 29, 31, 34, 36, 39, 41, 43, 46, 48, 51, 53, 56, 58, 61, 63, 65, 68, 70, 73, 75, 78, 80, 82, 85, 87, 90, 92, 95, 97, 100, 102, 104, 107, 109, 112, 114, 117, 119, 122, 124, 126, 129, 131, 134, 136, 139, 141, 144, 146, 148, 151, 153, 156, 158, 161, 163, 165, 168, 170, 173, 175, 178, 180, 183, 185, 187, 190, 192, 195, 197, 200, 202, 205

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..84.

MATHEMATICA

r=Pi/2; s=ArcSin[3/5]; t=ArcSin[4/5];

a[n_] := n + Floor[n*s/r] + Floor[n*t/r];

b[n_] := n + Floor[n*r/s] + Floor[n*t/s];

c[n_] := n + Floor[n*r/t] + Floor[n*s/t];

Table[a[n], {n, 1, 120}] (*A005408*)

Table[b[n], {n, 1, 120}] (*A189676*)