The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A189934 a(n) = A189932(n)/2. 3
 2, 5, 8, 11, 14, 17, 20, 23, 26, 28, 31, 34, 37, 40, 43, 46, 49, 52, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 83, 86, 89, 92, 95, 98, 101, 104, 107, 109, 112, 115, 118, 121, 124, 127, 130, 133, 136, 138, 141, 144, 147, 150, 153, 156, 159, 162, 164, 167, 170, 173, 176, 179, 182, 185, 188, 191, 193, 196, 199, 202, 205, 208, 211, 214, 217 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A189932. LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 FORMULA Equals (n + floor(n*(csc(pi/5))^2) + floor(n*(cot(pi/5))^2))/2, for n>=1. - G. C. Greubel, Jan 13 2018 MATHEMATICA r=1; s=Sin[Pi/5]^2; t=Cos[Pi/5]^2; 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}]  (*A189932*) Table[c[n], {n, 1, 120}]  (*A189933*) Table[b[n]/2, {n, 1, 120}]  (*A189934*) Table[c[n]/2, {n, 1, 120}]  (*A189935*) PROG (PARI) for(n=1, 100, print1((n + floor(n/(sin(Pi/5))^2) + floor(n/(tan(Pi/5))^2))/2, ", ")) \\ G. C. Greubel, Jan 13 2018 (MAGMA) C := ComplexField(); [(n + Floor(n/(Sin(Pi(C)/5))^2) + Floor(n/(Tan(Pi(C)/5))^2))/2: n in [1..100]]; // G. C. Greubel, Jan 13 2018 CROSSREFS Cf. A189932, A189933, A189935. Sequence in context: A329961 A078608 A329988 * A189386 A292661 A016789 Adjacent sequences:  A189931 A189932 A189933 * A189935 A189936 A189937 KEYWORD nonn AUTHOR Clark Kimberling, May 01 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 26 06:16 EDT 2021. Contains 347664 sequences. (Running on oeis4.)