A380099 a(n) is the n-digit numerator of the fraction h/k with h and k coprime positive integers at which abs((h/k)^4-Pi) is minimal.

4, 97, 888, 9551, 13549

Offset

1,1

Comments

a(1)^4 = 4^4 = 256 corresponds to the numerator of A210621.

Links

Table of n, a(n) for n=1..5.

Index entries for sequences related to the number Pi.

Example

  n               (h/k)^4    approximated value
  -   -------------------    ------------------
  1               (4/3)^4    3.1604938271604...
  2             (97/73)^4    3.1174212867620...
  3           (888/667)^4    3.1415829223858...
  4         (9551/7174)^4    3.1415927852873...
  5       (13549/10177)^4    3.1415926560044...
  ...

Mathematica

nmax = 3; a = {}; hmin = kmin = 0; For[n = 1, n <= nmax, n++, minim = Infinity; For[h = 10^(n-1), h <10^n, h++, For[k = 1, k < 10^n/Pi^(1/4), k++, If[(dist = Abs[h^4/k^4-Pi]) < minim && GCD[h, k]==1, minim = dist; hmin=h; kmin = k]]]; AppendTo[a, hmin]]; a

Crossrefs

Cf. A000583, A000796, A210621.

Cf. A355622, A364844, A380100 (denominator).

Sequence in context: A333539 A356808 A041275 * A024384 A368004 A320358

Adjacent sequences: A380096 A380097 A380098 * A380100 A380101 A380108

Keyword

nonn,base,frac,more,new

Author

Stefano Spezia, Jan 12 2025

Status

approved