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 A188290 Positions of 0 in the zero-one sequence [nr+4r]-[nr]-[4r], where r=sqrt(5) and []=floor. 1
 17, 34, 51, 68, 89, 106, 123, 140, 161, 178, 195, 212, 233, 250, 267, 284, 305, 322, 339, 356, 373, 394, 411, 428, 445, 466, 483, 500, 517, 538, 555, 572, 589, 610, 627, 644, 661, 678, 699, 716, 733, 750, 771, 788, 805, 822, 843, 860, 877, 894, 915, 932, 949, 966, 983, 1004, 1021, 1038, 1055 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A187950. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 MAPLE r := sqrt(5) ; for n from 1 to 1200 do         a := floor((n+4)*r)-floor(n*r)-floor(4*r) ;         if a = 0 then                 printf("%d, ", n);         end if; end do: # R. J. Mathar, Jun 03 2011 MATHEMATICA Flatten[Position[Table[Floor[(n+4)Sqrt[5]]-Floor[n*Sqrt[5]]-Floor[ 4*Sqrt[5]], {n, 1100}], 0]] (* Harvey P. Dale, Sep 23 2014 *) PROG (Python) from gmpy2 import isqrt A188290_list = [n for n in range(1, 10**6) if isqrt(5*(n+4)**2) - isqrt(5*n**2) == 8] # Chai Wah Wu, Oct 08 2016 CROSSREFS Cf. A187950. Sequence in context: A044842 A033014 A070814 * A268287 A249988 A098365 Adjacent sequences:  A188287 A188288 A188289 * A188291 A188292 A188293 KEYWORD nonn,easy AUTHOR Clark Kimberling, Mar 26 2011 EXTENSIONS All values corrected by R. J. Mathar, Jun 03 2011 STATUS approved

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Last modified May 10 23:31 EDT 2021. Contains 343784 sequences. (Running on oeis4.)